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Thermal elastic behavior of CaSiO3-walstromite: A powder X-ray diffraction study up to 900 °C
-
Xi Liu
,
Sicheng Wang
Published/Copyright:
April 2, 2015
Abstract
Walstromite-structured CaSiO3 (Wal) was synthesized at 6 GPa and 1200 °C for 6 h using a cubic press, and its thermal elastic behavior was investigated at T up to 900 °C using a powder X-ray diffraction technique at ambient pressure. Within the investigated T range, all unit-cell parameters, j, of Wal varied almost linearly with T, so that we fitted the data with the equation αj = j-1(∂j/∂T) and obtained αa = 0.92(2) × 10−5/°C, αb = 1.65(1) × 10−5/°C, αc = 0.83(1) × 10−5/°C, and αV = 3.24(3) × 10−5/°C for Wal. The magnitudes of the principal Lagrangian strain coefficients (ε1, ε2, and ε3) and the orientation of the thermal strain ellipsoids, between ambient T and measured T, were calculated. The orientation of the strain ellipsoid appears constant with T variation, whereas the strain magnitudes vary significantly with T: ε1 increases, but ε2 and ε3 decrease. For T > 900 °C, primitive data were collected for “parawollastonite” (Wo-2M), which led to a much smaller volumetric thermal expansion coefficient than that of Wal.
Keywords : CaSiO3-walstromite; high-P synthesizing; high-T X-ray diffraction; “parawollastonite”; thermal elasticity
Received: 2011-6-20
Accepted: 2011-10-11
Published Online: 2015-4-2
Published in Print: 2012-2-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
CaSiO3-walstromite;
high-P synthesizing;
high-T X-ray diffraction;
“parawollastonite”;
thermal elasticity
Articles in the same Issue
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- Thermal elastic behavior of CaSiO3-walstromite: A powder X-ray diffraction study up to 900 °C
- Magnesiohögbomite-2N4S: A new polysome from the central Sør Rondane Mountains, East Antarctica
- Hanjiangite, a new barium-vanadium phyllosilicate carbonate mineral from the Shiti barium deposit in the Dabashan region, China
- Combined neutron and X-ray diffraction determination of disorder in doped zirconolite-2M
- Focused ion beam preparation and characterization of single-crystal samples for high-pressure experiments in the diamond-anvil cell
- Phase stability and elastic properties of the NAL and CF phases in the NaMg2Al5SiO12 system from first principles
- Redistribution of REE, Y, Th, and U at high pressure: Allanite-forming reactions in impure meta-quartzites (Sesia Zone, Western Italian Alps)
- MAS NMR measurements and ab initio calculations of the 29Si chemical shifts in dumortierite and holtite
- Aluminum ordering and clustering in Al-rich synthetic phlogopite: {1H} → 29Si CPMAS HETCOR spectroscopy and atomistic calculations
- Cell assemblies for reproducible multi-anvil experiments (the COMPRES assemblies)
- Recrystallization rims in zircon (Valle d’Arbedo, Switzerland): An integrated cathodoluminescence, LA-ICP-MS, SHRIMP, and TEM study
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