Chii chinonzi Olivine Crystal Structure?

Olivine crystal structure ine orthorhombic gadziriro apo silicon yakatsaurwa-oxygen tetrahedra (SiO₄) inobatanidzwa nesimbi cations inogara octahedral sites. Chimiro ichi chinogona kuonekwa seine hexagonal close-packed array yemaatomu eokisijeni, nehafu yeoctahedral voids yakazadzwa nemagnesium kana iron ions uye chimwe{3}}chisere chetetrahedral voids inogarwa nesilicon.

Boka remuorivhi rinopenya mu orthorhombic crystal system pasi peboka repachadenga Pbnm (inonziwo Pnma mune mamwe marongero). Iyi yakakosha symmetry inotsanangura kuti maatomu anozvironga sei mukati mekristaro lattice uye inopesvedzera zvakananga zvimiro zvemaminerari.

Sero reyuniti rine mayuniti mana efomula (Z=4) uye rinoratidza mademo matatu asina kuenzana anopindirana pamakona ekurudyi. Forsterite (Mg₂SiO₄), maparamendi elatisi anokwana kuita=4.75 Å, b=10.20 Å, uye c=5.98 Å. Muchi fayalite (Fe₂SiO₄), maparamita aya anokura zvishoma kusvika ku=4.82 Å, b=10.48 Å, uye c=6.09 Å nokuda kweionic radius yakakura kana ichienzaniswa nemagnesium.

Iyo Pbnm nzvimbo yeboka dhizaini inoratidza yakakosha zvimiro. Iri boka remuchadenga rine ndege dzegirazi uye inversion centre, ichigadzira chaiyo symmetry zvipingaidzo panzvimbo dzeatomu. Nzvimbo nhatu dzakajeka dzeokisijeni (O1, O2, O3) dziripo mukati mechimiro, iine O1 neO2 yakarara pazvionioni ndege ukuwo O3 ichigara pachinzvimbo pasina kuenzanirana kwakakosha.

Pamwoyo wechimiro chemuorivhi pane SiO₄⁴⁻ tetrahedron iri yoga, uko pakati pesilicon atomu inosungirirana nemaatomu mana akatenderedza okisijeni. Matetrahedra aya akazvimirira zvachose-haagoverane maatomu eokisijeni netetrahedra yakavakidzana nayo, achiisa murudzi rwe olivine senesosilicate kana orthosilicate. Imwe neimwe Si-O bond inoyera ingangoita 1.63-1.66 Å uye inoratidza hunhu hwakasimba.

Tetrahedra inochinjana mukuita, inongedza kumusoro nekudzika mumitsara inofambirana necrystallographic c-axis. Iyi inotsinhanisa gadziriso inogadzira machaneli mukati mechimiro umo masimbi cations anogona kugara. Iyo silicon ion inongotora imwe chete crystallographically yakasarudzika saiti inogara pane yegirazi ndege, zvichireva kuti ese maatomu esilicon ari muchimiro ane hukama ne symmetry mashandiro.

Metal cations (kazhinji Mg²⁺ kana Fe²⁺) inotora nzvimbo mbiri dzakasiyana dzeoctahedral dzinonzi M1 uye M2. Iyo M1 saiti inogara pane inversion centre uye inoumba yakawedzera kukanganisa octahedron ine matanhatu akatenderedza maatomu eokisijeni. Metal-oxygen bond kureba muM1 inotangira pa 2.07-2.13 Å ye magnesium. Iyo M2 saiti yakarara pagirazi ndege uye inogadzira yakakura, yakajairika octahedron ine MO madaro anotenderera 2.04-2.21 Å.

Musiyano uripo pakati peM1 neM2 nzvimbo ine zvakakosha zvinokonzeresa kuti akasiyana cations anozviparadzira sei muchimiro. Mune magnesium-iron solid solution series, Mg²⁺ neFe²⁺ zvinoratidza nzvimbo shoma shoma{4}}zvose zvinotora nzvimbo dzeM1 neM2 pasina kusarudza kwakasimba. Zvakadaro, mu calcium-ine maolivines akaita semonticellite (CaMgSiO₄), maCa²⁺ ions makuru anonyanya kupinda munzvimbo dzakapamhama dzeM2 ukuwo Mg²⁺ ichifarira nzvimbo diki dzeM1.

olivine crystal structure

Imwe nzira yekutsanangura chimiro che olivine inosimbisa iyo oxygen sublattice. Maokisijeni anions anoumba anenge ane hexagonal close-yakarongedzwa (hcp) akarongwa akatevedzana ne-axis. Iyi dhizaini inopa scaffolding painomira nesilicon nesimbi cations.

Mukati meiyi hcp gadziriro yeokisijeni, masimbi esimbi anozadza hafu yeapo octahedral voids, ukuwo maatomu esilicon anotora chikamu chimwe-chisere chetetrahedral voids. Iyi yakasarudzika saiti kugara inogadzira hunhu olivine stoichiometry yeM₂SiO₄, uko M inomiririra divalent metal cations.

Atomu imwe neimwe yeokisijeni inosungirirana kune rimwe silicon nemaatomu matatu esimbi, zvichigadzira dense{0}}dimensional framework. Maatomu eokisijeni haana kuenzana-nezvinzvimbo zvitatu zvakasiyana siyana zveokisijeni (O1, O2, O3) dzine nharaunda dzakati siyanei yekubatana uye nhambwe kumaatomu ari pedyo. Uku kusiyanisa munzvimbo dzeokisijeni kunobatsira kune iyo yakazara dhizaini kuomarara uye inokanganisa zvivakwa zvakaita sekuwedzera kwekupisa uye kusimba.

Matunhu emupendero{{0}kugoverana octahedra anotambanudzira kufambirana ne(100) ndege, yakachinjika-yakabatanidzwa neiyo yoga SiO₄ tetrahedra. Hunhu hwakaturikidzwa uhu hunova hwakanyanya kukosha pasi pekushushikana kwakaiswa, sezvo huchigadzira ndege dzinogona kutsvedza dzinopesvedzera mashandiro eolivine uye seismic zvimiro mujasi rePasi.

Chimiro chekristaro chaOlivine chinogashira chigadziriso chakasimba chinoramba chiri pakati pe magnesium end-member forsterite (Mg₂SiO₄) ne iron end-member fayalite (Fe₂SiO₄). Uku kusawirirana kuripo nekuti Mg²⁺ (ionic radius ~0.72 Å) uye Fe²⁺ (ionic radius ~0.77 Å) anosiyana muhukuru ne7% chete, zvichivabvumira kutsiva vakasununguka pasina kukanganisa zvakanyanya chimiro chekristaro.

Maumbirwo anowanzo kuratidzwa se molar percentage, senge Fo₇₀Fa₃₀ (kana kungoti Fo₇₀), zvichiratidza 70% forsterite uye 30% fayalite. Maorivhi echisikigo kubva kumatombo emafic anowanzo kubva kuFo₅₀ kuenda kuFo₉₀, nepo maolivini echipfeko achiwanzoita magnesian, ane nziyo dzakatenderedza Fo₈₈ kuenda kuFo₉₂.

Iyo lattice parameters inowedzera zvakada kuita linear ine iron content. SeFe²⁺ inotsiva Mg²⁺, sero reyuniti rinokura nekuti saizi yesimbi yakakura inosundira maatomu kure zvishoma. Hukama uhwu hunofanotaurwa zvekuti chiyero chesero cheyuniti chinogona kushandiswa kuona kuumbwa kweolivine nekurongeka.

Kunze kweMg hombe-Fe substitution, chimiro che olivine chinogona kubatanidza zvidiki zvemamwe ma cations. Calcium inopinda muchimiro muhuwandu hushoma, ichisarudza iyo M2 saiti. Manganese (mu tephroite, Mn₂SiO₄) inogona kutsiva zvachose magnesium kana iron. Tevera huwandu hwenickel, chromium, uye kunyange ferric iron (Fe³⁺) inogona kutsiva munzvimbo dzeoctahedral, kunyangwe muzvikamu zvidiki.

Olivine chimiro chinoramba chakagadzikana chete pasi pekumanikidzwa kwakananga uye tembiricha mamiriro. Sezvo kudzika kunowedzera mukati mePasi, kurongeka kweolivine kunova kusingafadzi uye kushanduka kuita denser polymorphs ane akasiyana makristasi zvimiro.

Panenge pakadzika 410 km (zvinoenderana nezvinomanikidza zvakatenderedza 14 GPa), olivine inopinda exothermic chikamu shanduko kuenda kune wadsleyite. Shanduko iyi inosanganisira kurongeka patsva uko oxygen sublattice inosimuka kubva kune hexagonal kuvhara-kurongedza kuenda kune imwe cubic gadziriro. Wadsleyite inoramba iine orthorhombic symmetry asi inotora yakagadziridzwa spinel{5}sechimiro chine mamwe maatomu esilicon muoctahedral coordination.

Yakadzika mujasi rePasi, pahupamhi hwe520 km (18-20 GPa), wadsleyite inoshanduka kuita ringwoodite, iyo inotora cubic spinel chimiro. Mu ringwoodite, ese silicon inogara octahedral nzvimbo kwete tetrahedral zvinzvimbo. Idzi shanduko dzechikamu dzinokonzeresa kuwanda kwekukurumidza kunowedzera izvo seismologists vanoona senge discontinuities mu seismic wave velocities.

Kumanikidzwa kunoitwa shanduko idzi kunoenderana nekupisa uye kuumbwa. Iron{{1}rich olivine inosandura pakushomeka kwakaderera pane magnesium-mhando dzakapfuma. Pa800℃, pure forsterite inoshandura kuita wadsleyite pa11.8 GPa, ukuwo wadsleyite-ku-ringwoodite shanduko inoitika pamusoro pe14 GPa. Simbi inoguma-nhengo fayalite inosvetuka chimiro chewadsleyite zvachose uye inosandura yakananga ku ahrensite (iron-inotakura ringwoodite analogi) pazvinesimba zvakaderera.

olivine crystal structure

Mamiriro e olivine anopindura anisotropically kune kuiswa kudzvanywa{{0} kwakasiyana crystallographic directions compress at different rates. Iyo M2 octahedron inomanikidza zviri nyore kupfuura iyo M1 octahedron pane ese maumbirwo kubva kuforsterite kuenda kuFayalite. Uku kudzvanya kwakasiyana kunoitika nekuti iyo M2 saiti ine hombe yekutanga vhoriyamu uye yakawedzera kuchinjika mukugadzirisa kwayo kwekubatanidza.

Single{{0}crystal X-ray diffraction zvidzidzo zvekusvika pa8 GPa zvinoratidza kuti kureba kweM2-O kunopfupika kupfuura M1-O mabhondi kana pakamanikidzwa. Iyo M1 octahedron inova isinganyanyi kudzvanywa nekuwedzera simbi yemukati, izvo zvinokatyamadza zvinokonzeresa kuwanda modulus (yakazara kuramba kumanikidza) kuwedzera zvishoma kubva kuforsterite kuenda kuFayalite-mhedzisiro yekutanga inopesana nekuti iron inorema kupfuura magnesium.

Kupisa kunokanganisa chimiro zvakasiyana. Kupisa kunoita kuti unit cell ikunde, -axis ichiratidza hukuru hwekuwedzera kwemafuta. High-zvidzidzo zvetembiricha yeforsterite inosvika 900 degrees zvinoratidza kuti M-O kureba kwebhondi kunowedzera zvakarongeka, asi basic structural topology inoramba isina kushanduka kusvika tembiricha yekunyungudika yaswedera.

SiO₄ tetrahedra inoratidza kuomarara zvichienzaniswa nesimbi-oxygen octahedra. Si-O kureba kwebhondi kunoshanduka zvishoma kana kumanikidzika kana tembiricha nekuda kwechimiro chakasimba chekubatana kweSi-O mabhondi. Kunyanya kuchinjika kunobva mukugadziridzwa muM-O kureba kwebhondi nemakona ari pakati pepolyhedra pane kudzvanya kwepolyhedra pachayo.

Iyo olivine chimiro chechimiro chinowana yakakosha tekinoroji application mukatilithium iron phosphate mabhatiri(LiFePO₄ kana LFP). Yakawanikwa se cathode zvinhu muna 1996, lithium iron phosphate inotora yakafanana yakakosha olivine chimiro semhando yemaminerari olivine, kunyange nemapoka ephosphate achitsiva iyo yakazvimiririra silicate tetrahedra.

MuLiFePO₄, chimiro chinochengetedza orthorhombic symmetry (space group Pnma/Pbnm) ine lattice parameters a=6.008 Å, b=10.334 Å, uye c=4.693 Å. Maatomu esimbi anogara munzvimbo dzeoctahedral (kuumba FeO₆ octahedra), nepo maatomu ephosphorous achigara munzvimbo dzetetrahedral (kuumba PO₄ tetrahedra), inofananidzwa nemarongedzerwe esimbi nesilicon mumamineral olivine.

Musiyano wakakosha uri mune yekuwedzera lithium cations. Lithium ions inogara mune octahedral chiteshi mukati meiyo chimiro, yakarongedzwa mune zigzag pateni. Munguva yekuchaja uye kuburitsa bhatiri, lithium ion inogona kudzokororwa kubva nekupinzwa mumatanho aya pasina kudonhedza iyo yakakosha olivine chimiro. Simbi inopinda redox bhasikoro pakati peFe²⁺ neFe³⁺ kuchengetedza chiyero chechaji sezvo lithium ichipinda nekubuda.

Uku kugadzikana-kwakagara nhaka kubva kune yakasimba ye olivine architecture{1}}inopa LiFePO₄ mabhatiri akasarudzika ekuchengetedza maitiro uye kutenderera kwenguva refu. P-O covalent mabhondi ari muphosphate tetrahedra anoramba kuburitswa kweokisijeni, achidzivirira kubuda kwemafuta ayo anokanganisa mamwe makemikari ebhatiri e-lithium{4}}. Mabhatiri eLFP eCommerce anogona kuwana zvinopfuura 3,000 kuchaji{8}}madhizaini ekuburitsa uku achichengetedza huwandu.

Mamiriro e olivine anoisa muganhu mumwe chete: Lithium ion inofanira kupararira ne-dimensional channels pamwe chete necrystallographic axes pane kufamba zvakasununguka mumativi matatu. Izvi zvinomisa ionic conductivity uye chiyero kugona. Vatsvakurudzi vanogadzirisa izvi kuburikidza ne nanostructuring (kuderedza saizi yechidimbu kupfupisa nzira dzekuparadzira) uye kabhoni coating (kunatsiridza magetsi conductivity). Shanduro dzakagadziridzwa senge lithium manganese iron phosphate (LMFP) inochengetedza iyo olivine chimiro ichitsiva manganese kune imwe iron kuti iwedzere kushanda voltage.

Kunzwisisa kwazvino kwechimiro che olivine kunobva zvakanyanya kubva kuX-ray diffraction maitiro. William Lawrence Bragg naGB Brown vakatanga kuona chimiro chekristaro cheforsterite muna 1926 vachishandisa nzira dzekutanga dzeX-ray crystallography. Basa ravo rakagadzira olivine seyakaumbwa neSiO₄ tetrahedra yakaparadzaniswa-hwaro hweruzivo rwesilicate mineralogy.

Single{{0}crystal X-ray diffraction inoramba iri mwero wegoridhe wekunyatso tara. Kamuorivhi kadiki kristaro (kazhinji 0.1-0.5 mm) inoiswa pagoniometer uye inotenderedzwa nepa X-ray. Iyo inokonzeresa diffraction maitiro ine zviuru zvezviratidziro zvega, imwe neimwe inomiririra seti yakasiyana yecrystallographic ndege. Sophisticated software inonatsa nzvimbo dzeatomu, maparameta ekupisa, uye kugara kwesaiti kuti ienderane neinocherechedzwa kusiyanisa kusimba.

Neutron diffraction inopa ruzivo rwekuwedzera, kunyanya kukosha pakutsvaga maatomu ehydrogen (muzvikamu zve hydrous) uye kusiyanisa pakati pezvinhu zvine maerekitironi akafanana akafanana nemagnesium nealuminium. Neutron kuyedza inoda makristasi akakura uye zvivakwa zvehunyanzvi zvine manyutroni masosi, asi iwo anopa kurongeka kwepamusoro kwekuona magineti zvimiro uye zvimwe zvimiro zvechiedza.

Transmission electron microscopy (TEM) inoongorora chimiro che olivine pane nanoscale, ichiratidza hurema, miganhu yedomeni, uye misiyano yemunharaunda isingaonekwe kune nzira dzekusiyanisa. Yakakwirira-yakagadziriswa TEM inokwanisa kufananidza makoramu emaatomu ega ega, ichinyatsoona marongerwo emaatomu. Izvi zvinova zvine simba zvakanyanya kana uchidzidza akaremara samples kana nhanho shanduko apo chimiro chinosiyana pamadaro madiki.

Raman uye infrared spectroscopy probe olivine chimiro kuburikidza ne vibrational modes. SiO₄ tetrahedron ine mamodhi mana anokosha ekuzungunusa, uye mafambiro ayo anoenderana neSi-O bond simba uye nharaunda yakatenderedza yezvimiro. Maumbirwo anokanganisa mafambiro ekudengenyeka aya nenzira dzinozivikanwa-forsterite inoratidza mapeaks akasiyana pane efayalite nekuti Fe-O mabhondi haana simba pane Mg-O mabhondi. Aya ma spectroscopic maitiro anoshanda asiri-kuparadza uye anogona kuratidza diki samples kana inclusions.

Iyo crystallographic kurongeka inodzora zvakananga zvinhu zvinoonekwa zve olivine. Iyo mineral inowanzoita muorivhi{{1}yegirini nekuti Fe²⁺ ions muoctahedral coordination inotora mwenje mune chaiwo wavelengths, ichiendesa girinhi. Forsterite yakachena haina ruvara kune yero yakachenuruka-yegirini, ukuwo iron{4}yakapfuma maumbirwo anoita girinhi yakasvibira kusvika kubrown-dema.

Olivine anoratidza conchoidal kutyoka kwete kutsemuka nekuti matatu-dimensional framework yeyoga tetrahedra yakasungirirwa kune octahedra inogadzira zvisungo zvakasimba zvakaenzana kumativi ese. Hapana ndege dzehutera dziripo muchimiro chinofananidzwa nemashizha zvimiro mu micas kana layer silicates. Kana olivine ikatsemuka, inotsemuka zvisingaite pachimiro pane kutsemuka pamwe nendege dzakajeka dzekristaro.

The orthorhombic symmetry inogadzira anisotropic properties-chimiro chemuviri chinosiyana necrystallographic direction. Seismic wave velocities inosiyana zvichienderana negwara rekuparadzira rine hukama nekristaro axes. Kukurumidza nhangemutange kunofambirana ne-axis, velocity yepakati kusvika kune c-axis, uye inononoka velocity kune b-axis. Iyi seismic anisotropy mune mantle olivine inobatsira geophysicists kududzira gwara uye hukuru hwekuyerera kwejasi.

Kuomarara (6.5-7 pachikero cheMohs) uye density (3.27-3.37 g/cm³ yeforsterite, 4.39 g/cm³ yefayalite) zvese zvine chekuita nekurongedza kwakasimba kwechimiro uye kusimba kwesimbi-okisijeni mabhondi. Iyo denser okisijeni chimiro uye mapfupi esimbi-okisijeni madaro muchimiro cheolivine inogadzira yakaoma, yakaoma mineral inoshingirira kumamiriro ekunze emakemikari pasi pemamiriro ePasi akadzika.

olivine crystal structure

Makristasi chaiwo omuorivhi ane zvimiro zvisina kukwana zvinokanganisa maitiro avo zvakanyanya. Kukanganisa kunosanganisira nzvimbo (maatomu asipo), interstitials (mamwe maatomu akasvinwa munzvimbo dzinogara dzisina munhu), uye kuremara (kukanganisa maatomu panzvimbo dzakajairika). Izvi zvinokanganisa, kunyange zvisingawanzo, zvinodzora kupararira kwehuwandu uye magetsi ekugadzirisa nekugadzira nzira dzekufamba kweionic.

Kusarongeka-kukanganiswa kwemutsetse uko kurongeka kwecrystallographic kunoparara{{1}kunotonga zvinhu zve olivine. Dislocation creep (kufamba kweiyi mutsara kukanganisa kuburikidza nekristaro) inomiririra yakakura deformation nzira mune mantle olivine pasi pe geological timescales. Iwo chaiwo anotsvedza masisitimu (ndege dzecrystallographic uye mafambiro ekufambisa kwekufamba) inotarisisa kuti maorivhine zviyo zvinokanganisa sei uye kukudziridza inofarirwa crystallographic orientation.

Kuremara kwakawedzera senge miganhu yezviyo uye mapatya miganhu inogadzira nzvimbo dzekupindirana uko iyo kristaro chimiro chinoshanduka kubva kune imwe kutaridzika kuenda kune imwe. Iyi miganhu inokanganisa simba remagetsi uye inopa kukurumidza kupararira nzira dzekuchinja kwemakemikari. Subgrain boundaries-yakaderera-makona miganhu inoumbwa nemitsara yezvisungo{4}}inogadzirwa muorivhine yakaremara uye inonyora deformation nhoroondo.

Pamusoro pePasi, mamiriro ekunze emuorivhi anokurumidza kukurumidza kunyangwe chimiro chayo chakasimba. Mamorekuru emvura anogona kupinda pamwe nekuremara uye miganhu yezviyo, achibata neye olivine chimiro. Chigadzirwa chinowanzo shandurwa inyoka, inoumbwa kana mamorekuru emvura akaiswa muchimiro: 2Mg₂SiO₄ + 3H₂O → Mg₃Si₂O₅(OH)₄ + Mg(OH)₂. Kuita uku kunowedzera vhoriyamu yepakutanga ne30-40% uye inoparadza iyo yekutanga olivine chimiro, ichiitsiva nepepa silicate layer.

Zvimwe zvinogadziriswa zvinosanganisira iddingsite (musanganiswa{{0}uyo wakatsetseka) wemairon oxides nemaminerari evhu) uye bowlingite (hydrated iron-inotakura silicates). Aya maitiro ekushandura anoenderera nekukurumidza pamwe nekutsemuka uye kristaro mipendero uko mvura inokwanisa kuwana chimiro zviri nyore. Yakazara pseudomorphic kutsiva inogona kuitika, uko yakashandurwa zvinhu inochengeta yekunze kristaro chimiro uku iyo yemukati chimiro ichishandura zvachose kuita yechipiri zvicherwa.

Chii chinoita kuti olivine chimiro chakasiyana kubva kune mamwe silicate minerals?

Olivine ine SiO₄ tetrahedra yakazvimiririra isingagovane maatomu eokisijeni, ichitsanangura senesosilicate. Izvi zvinopesana neketani silicates (senge pyroxenes), sheet silicates (semicas), uye furemu silicates (senge quartz) uko tetrahedra inogovera okisijeni kuti iumbe akawedzera zvimiro. Iyo tetrahedra iri yoga inogadzira gobvu nhatu-netiweki yedimensional inobatwa pamwechete nesimbi-oxygen bond.

Sei olivine ine maviri akasiyana simbi nzvimbo (M1 uye M2)?

Iyo orthorhombic symmetry uye iyo chaiyo yekurongedza kurongeka kwemaatomu eokisijeni inogadzira maviri ecrystallographically akasiyana octahedral zvinzvimbo zvine hukuru hwakati siyanei uye kukanganisa. M1 inogara pane inversion centre uye idiki uye yakanyanya kukanganisa, nepo M2 yakarara pagirazi ndege uye yakakura uye yakajairika. Musiyano uyu unobata kuti ndedzipi cations dzinosarudza kuti ndedzipi saiti uye inodzora zvinhu zvenyama zvemukati.

Kuumbwa kunobata sei olivine crystal chimiro?

Sezvo iron inotsiva magnesium pane forsterite-fayalite series, unit cell inokura zvakafanana nekuti Fe²⁺ ihombe pane Mg²⁺. The basic structural topology inoramba isina kuchinjwa-boka remuchadenga rimwechete, nzvimbo dzeatomu dzakafanana, nharaunda dzekudyidzana dzakafanana. Hurefu hwebhondi hunowedzera zvishoma, asi kuronga kwemaatomu kunoramba kwakafanana. Izvi zvinobvumira mhinduro yakasimba pakati penhengo dzekupedzisira-.

Chimiro cheolivine chingagadzika mvura kana zvimwe zvinoputika here?

Yakajairwa olivine chimiro haina hydroxyl mapoka kana molecular mvura. Zvakadaro, kuronda huwandu hwehaidhirojeni hunogona kusanganisirwa sehurema-kazhinji semapoka eOH achitsiva maatomu eokisijeni kana anogara munzvimbo dzinogara dzisina vanhu. Izvi "mvura" zviri mukati zvinoramba zvakaderera (kazhinji<50 ppm by weight), but even trace hydrogen significantly affects electrical conductivity and diffusion rates. Water content increases with pressure, making transition zone olivine polymorphs potentially important water reservoirs in Earth's deep interior.

Iyo olivine crystal chimiro inoratidza anotevera akakosha maitiro:

Crystal System: Orthorhombic neboka remuchadenga Pbnm (kana Pnma mune mamwe marongero)

Lattice Parameters:

Forsterite: a ≈ 4.75 Å, b ≈ 10.20 Å, c ≈ 5.98 Å

Fayalite: a ≈ 4.82 Å, b ≈ 10.48 Å, c ≈ 6.09 Å

Zvivharo zvekuvaka: Isolated SiO₄ tetrahedra yakabatana nesimbi-oxygen octahedra (MO₆)

Metal Sites: Nzvimbo mbiri dzakasiyana dzeoctahedral (M1 uye M2) dzine hukuru hwakasiyana uye kukanganisa

Oxygen Positions: Matatu matatu akasarudzika akasarudzika okisijeni nzvimbo mune asymmetric unit

Rudzi rweChimiro: Hexagonal inovhara{{0}yakazara okisijeni array ine cations mu tetrahedral uye octahedral voids

Classification: Nesosilicate (orthosilicate) nekuda kwemayuniti etetrahedral ega

Coordination: Si mu 4-coordination (tetrahedral), M cations mu6-kubatana (octahedral)

Ichi chimiro chechimiro chinoratidza kusimba zvinoshamisa, kuchengetedza kugadzikana mukati mehupamhi hwekuumbwa kwenzvimbo munzvimbo dzejoloji uku ichipawo hwaro hwezvinhu zvemabhatiri epamberi mukushandisa tekinoroji. Musanganiswa wemuorivhi weSi{1}O bonds ane simbi inochinjika-oxygen coordination inoita kuti ive imwe yezvicherwa zvePasi zvakakosha uye zvinogoneka.