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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...
Thecrystalstructureof(Mg Li Sc )Si O protopyroxenehasbeenstudiedwithsin- 1.54 0.23 0.23 2 6 le-crystalX-raydiffractionatpressuresto9.98GPaandRamanspectroscopyto10.4cn GPa.A?rst-orderdisplacivephase...
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...
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 ...
Otavite(CdCO )recoveredfromexperimentsat P 170kbarand T 1000Ccon-tainedmaterialwiththearagonitestructure,indicatingthataphasetransitionoccurred. Thelatticeparametersofthearagonite-typeCdCOare a 4.989...
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...
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...
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...
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)...
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...
Raman spectra oftwo synthetic, noncubic garnet samples rich in MgSi03component weremeasuredin adiamond-anvil cellto 200kbar atroom temperature. Sample1was pure MgSi03majorite;sample 2wasa solid soluti...
Thehigh-temperature cell parameters ofK2MgSis012have been measuredbyX-ray powder diffractionbetweenroom temperature and 842K.Afirst-order ferroelastic phase transition between the room-temperature P2...

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