Crystal chemical characteristics of α-CaSi 2 O 5 , a new high pressure calcium silicate with five-coordinated silicon synthesized at 1500°C and 10 GPa

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The crystal structure of α-CaSi2O5 synthesized at conditions of 1500°C and 10 GPa, has been solved and refined in centrosymmetric space group P\(\), using single crystal X-ray diffraction data. The composition (Z=4) and unit cell are Ca1.02Si1.99O5 by EPMA analysis and a=7.243(2) A, b=7.546(4) A, c=6.501(4) A, α=81.43(5)°,

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