搜索结果: 1-12 共查到“地质学 phase transition”相关记录12条 . 查询时间(0.082 秒)
Is "metamictization" of zircon a phase transition?
∞metamictizatio phase transition zircon
2012/3/31
Diffuse X-ray scattering from single crystals of metamict zircon reveals residual crystallinity18
?-decay events/g). The experimental evidence does not sug-
even at high fluences (up to 7.2 ? 10
g...
A new pyroxene structure observed at high pressure: Single-crystal X-ray and Raman study of Pbcn-P21cn phase transition in protopyroxene
Single-crystal X-ray high pressure phase transition
2012/3/30
Thecrystalstructureof(Mg Li Sc )Si O protopyroxenehasbeenstudiedwithsin-
1.54 0.23 0.23 2 6
le-crystalX-raydiffractionatpressuresto9.98GPaandRamanspectroscopyto10.4cn
GPa.A?rst-orderdisplacivephase...
High-pressure single-crystal X-ray diffraction and infrared spectroscopic studies of the C2/m-P21/m phase transition in cummingtonite
High-pressure single-crystal X-ray diffraction spectroscopic studies C2/m-P21/m phase transition cummingtonite
2012/3/31
The structural changes associated with the C 2/ m - P 21/ m phase transition in cumming-tonite with (Fe 1 Mn)/(Fe1 Mn1 Mg) ┆ 0.50 have been studied with single-crystal X-ray diffraction at various pre...
Calibration of excess thermodynamic properties and elastic constant variations due to the α ↔ β phase transition in quartz
Calibration thermodynamic properties
2012/3/30
Spontaneous strains for the a ↔b transition in quartz were determined from lattice parameter data collected by X-ray powder diffraction and neutron powder diffraction over the temperature range ...
A calcite → aragonite-type phase transition in CdCO3
calcite → aragonite-type phase transition CdCO3
2012/4/5
Otavite(CdCO )recoveredfromexperimentsat P 170kbarand T 1000Ccon-tainedmaterialwiththearagonitestructure,indicatingthataphasetransitionoccurred.
Thelatticeparametersofthearagonite-typeCdCOare a 4.989...
Structural phase transition near 825 K in titanite: Evidence from infrared spectroscopic observations
Structural phase transition 825 K titanite Evidence infrared spectroscopic observations
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...
Si-Al order and the I1 - I 2/c structural phase transition in synthetic CaAl2Si2O8- SrAl2Si2O8 feldspar: A 29Si MAS-NMR spectroscopic study
Si-Al order I1 - I 2/c structural phase transition synthetic CaAl2Si2O8- SrAl2Si2O8 feldspar A 29Si MAS-NMR spectroscopic study
2012/4/1
We present 29SiMAS-NMR spectroscopic data for a series of synthetic feldspar samples
along the join CaAI2Si20g-SrAI2Si20g, from which the composition dependence and cou-
pling of order parameters de...
Displacive phase transition in anorthoclase: The "plateau effect" and the effect of T1-T2 ordering on the transition temperature
Displacive phase transition anorthoclase plateau effect T1-T2 transition temperature
2012/4/9
The effects of compositional changes and nonsymmetry-breaking AI-Siordering onthe displacive phase transition in anorthoclase have been studied using X-ray powder diffrac-tion. The results wereanalyze...
High pressure phase transition in titanite (CaTiOSiO4)
High pressure phase transition titanite (CaTiOSiO4)
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)...
Prediction of phase transition in CaSiO3 perovskite and implications for lower mantle structure
Prediction phase transition CaSiO3 perovskite implications mantle structure
2012/4/6
First-principleslinear-response calculations wereusedto investigate the lattice dynamics ofwhatis thought to be the third mostabundant phase in the lower mantle,CaSi03 perovskite.Thecommonly assumed c...
A pressure-induced phase transition in MgSiO3-rich garnet revealed by Raman spectroscopy
pressure-induced phase transition MgSiO3-rich garnet Raman spectroscopy
2012/4/6
Raman spectra oftwo synthetic, noncubic garnet samples rich in MgSi03component weremeasuredin adiamond-anvil cellto 200kbar atroom temperature. Sample1was pure MgSi03majorite;sample 2wasa solid soluti...
Monoclinic-orthorhombic phase transition in K2MgSi5O12 leucite analog
Monoclinic-orthorhombic phase transition K2MgSi5O12 leucite analog
2012/4/5
Thehigh-temperature cell parameters ofK2MgSis012have been measuredbyX-ray powder diffractionbetweenroom temperature and 842K.Afirst-order ferroelastic phase
transition between the room-temperature P2...