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- Title
Cubic perovskite polymorph of strontium metasilicate at high pressures.
- Authors
WANSHENG XIAO; DAYONG TAN; WEI ZHOU; JING LIU; JIAN XU
- Abstract
By using a diamond-anvil cell (DAC) with laser heating technology, a cubic perovskite polymorph of SrSiO3 has been synthesized at ~38 GPa and 1500-2000 K for the first time. The P-V data of this new phase give ambient temperate elastic constants of V0 = 49.18(5) ų, K0 = 211(3) GPa, respectively, when they are fitted against the Birch-Murnaghan equation of state with a fixed K0' at 4. On decompression, the SrSiO3 cubic perovskite phase becomes unstable at ~6.2 GPa and disappears completely at ~4.7 GPa. The transformed product can be considered as an amorphous phase with a minor amount of small sized crystals in the amorphous matrix. First principle calculations predicted structural properties of both the cubic and the six-layer-repeated hexagonal perovskite polymorphs of SrSiO3 in good agreement with experimental results. The experimental and theoretical results indicate that the larger Sr2+ cation can substitute the Ca2+ cation and enter into the lattice of the cubic perovskite phase of CaSiO3 at lower mantle conditions with only a small lattice strain. These results indicate that Sr can be hosted in cubic perovskite CaSiO3 found as inclusions in diamonds originating from the lower mantle.
- Subjects
PEROVSKITE; STRONTIUM; SILICATE minerals; HIGH pressure (Science); POLYMORPHISM (Crystallography)
- Publication
American Mineralogist, 2013, Vol 98, Issue 11/12, p2096
- ISSN
0003-004X
- Publication type
Article
- DOI
10.2138/am.2013.4470