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The synthesis and crystal structure of CaAlFSiO4, the Al-F analog of titanite
synthesis and crystal structure Al-F analog titanite CaAlFSiO4
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2012/3/31
Aluminum-rich titanites [Ca(Ti,Al)(O,F)SiO ] with X > 0.53 [X = Al/(Al+Ti)], including the
pure end-member CaAlFSiOwere synthesized for the first time in a high-pressure experimental
was determined...
Stability of high-Al titanite from low-pressure calcsilicates in light of fluid and host-rock composition
high-Al titanite low-pressure fluid and host-rock
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2012/3/31
Our recent paper noted that °∞some of the existing [M?ssbauer] studies (e.g., Fuchs et al. 1995) should be discounted due to th
fact that peak widths are less than the theoretical minimum imposed by ...
Stability of high-Al titanite from low-pressure calcsilicates in light of fluid and host-rock composition
Titanite of variable Al composition
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2012/3/30
TitaniteofvariableAlandFcontentwasfoundingranulite-toamphibolite-facies
calcsilicatesinCentralDronningMaudLand,Antarctica.ThehighestobservedAlcon-
tentcorrespondstoanX
[ Al/(Al Ti)]of0.53.Previousl...
Thermal annealing of radiation damaged titanite
Thermal annealing radiation damaged titanite
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2012/4/1
Radiogenic impurities of 400 to 800 ppm U and Th in titanite, CaTiSiO5, lead to mod-erate radiation damage (?.5 3 10 18 a-decay events/g) and therefore to partial amorphi-zation (?0%). Powder X-ray di...
Equilibria among titanite, hedenbergite, fayalite, quartz, ilmenite, and magnetite: Experiments and internally consistent thermodynamic data for titanite
hedenbergite fayalite magnetite thermodynamic data titanite
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2012/3/31
For iron-rich compositions, reactions among titanite, clinopyroxene, olivine, quartz,magnetite, and ilmenite can constrain the conditions under which common rocks form.Phase equilibrium experiments in...
MnSi2O5 with the titanite structure: A new high-pressure phase in the MnO-SiO2 binary
MnSi2O5 high-pressure phase MnO-SiO2 binary
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2012/3/31
Single crystals of MnSiO(SiO4) with the titanite structure together with MnSiO3 clino-pyroxene were synthesized from a MnO-SiO2 oxide mixture at 10008 C and 9.2 GPa in a multi-anvil press. The crystal...
Thermochemistry and the enthalpy of formation of synthetic end-member (CaTiSiO5) titanite
Thermochemistry formation synthetic end-member CaTiSiO5 titanite
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2012/4/5
Theenthalpyofdropsolutionofaquicklyquenched,clear,titaniteglasssampleandseveralsynthetic,polycrystalline,sampleswasmeasuredinaCalvet-typecalorimeterin2PbO!/
O solventat702C.Theenthalpyofformationofst...
Synthesis methods and unit-cell volume of end-member titanite (CaTiOSiO4)
Synthesis methods unit-cell volume end-member titanite CaTiOSiO4
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2012/4/5
Unit-cellparametersofsynthetic,end-membertitanite(CaTiOSiO )criticallydependonthesynthesisconditions,asisshownforstudiesreportedintheliteratureandfornew
samplesreportedhere.Ourstudysuggeststhatphase-...
Anti-phase boundaries and phase transitions in titanite: An X-ray diffraction study
Anti-phase boundaries phase transitions titanite X-ray diffraction study
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2012/4/5
X-raydiffractionrockingcurvesoftitanite,CaTiSiO ,weremeasuredusinganovelhigh-resolutiondiffractometer.ThreeBraggre?ectionswererecordedasafunctionoftemperatureandtheirpro?lesanalyzedintermsofaGaussianB...
Incorporation of rare earth elements in titanite: Stabilization of the A2/a dimorph by creation of antiphase boundaries
Incorporation rare earth elements titanite Stabilization A2/a dimorph creation antiphase boundaries
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2012/4/5
Theatomicarrangementofanaturalrare-earth-richtitaniteandtwosyntheticrare-earth-
dopedtitaniteshavebeenre?nedinspacegroup A2/a, andtheatomicarrangementofanundoped P2
/a synthetictitanitewasalsore?ned...
Fivefold-coordinated Ti4+ in metamict zirconolite and titanite: A new occurrence shown by Ti K-edge XANES spectroscopy
Fivefold-coordinated Ti4+ metamict zirconolite titanite new occurrence shown Ti K-edge XANES spectroscopy
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2012/4/1
The coordination environments of Ti in two fully metamict zirconolite samples and two
partially metamict titanite samples were determined using high-resolution, X-ray absorp-
tion near-edge structur...
Structural phase transition near 825 K in titanite: Evidence from infrared spectroscopic observations
Structural phase transition 825 K titanite Evidence infrared spectroscopic observations
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2012/4/1
We report the direct experimental observation of a structural anomaly near 825 K insynthetic and natural titanite samples by high-temperature, hard-mode infrared spectros-copy. The anomaly in titanite...
High pressure phase transition in titanite (CaTiOSiO4)
High pressure phase transition titanite (CaTiOSiO4)
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2012/4/9
Apressure-induced phase transition was observed in a sample of synthetic titanite (CaTiOSi04). The high-pressure structure was refined in space group A21a [a
= 6.8912(3), b = 8.6234(3), c = 6.4065(3)...