Abstract
Synthetic crystalline (wollastonite) and glass forms of CaSiO 3 have been compressed to loading pressures above 160 kbar and heated to about 1500° C by a laser in a diamond-anvil cell. After cooling, an X-ray diffraction study carried out whilst the sample was maintained at high pressure revealed that it had transformed to a cubic perovskite-type 3olymorph with a = 3.485 ± 0.008A˚. After release of pressure, however, the sample showed a mixture of glass plus a few weak lines corresponding to ε-CaSiO 3 which is thus interpreted as a retrogressive transition product. The density of the perovskite polymorph of CaSiO 3 is about 9.2% greater than that of an isochemical mixture of CaO + SiO 2 (stishovite) at about 160 kbar.
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