Crystal chemical characteristics of α-CaSi2O5, a new high pressure calcium silicate with five-coordinated silicon synthesized at 1500°C and 10 GPa

Y. Kudoh, Masami Kanzaki

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Abstract

The crystal structure of αCaSi2O5 synthesized at conditions of 1500°C and 10 GPa, has been solved and refined in centrosymmetric space group P1, 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)°, β = 84.82(4)°, γ = 69.60(3)°, V = 329.5(3) A3, yielding the density value, 3.55 g/cm3. The structures the square-pyramid five-fold coordination of silicon by oxygen. The ionic radius for five-coordinated Si calculated from the bond distances is 0.33 A. The substantial deviation of valence sume for Ca indicates the existence of local strain and the instability of α-CaSi2O5 at room temperature.

Original languageEnglish
Pages (from-to)429-433
Number of pages5
JournalPhysics and Chemistry of Minerals
Volume25
Issue number6
DOIs
Publication statusPublished - Jun 1998

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Calcium silicate
Electron probe microanalysis
Silicon
crystal structure
silicon
silicate
Crystal structure
calcium
X-ray diffraction
Single crystals
crystal
Oxygen
fold
X ray diffraction
oxygen
Crystals
Chemical analysis
temperature
Temperature
analysis

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Materials Science(all)

Cite this

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title = "Crystal chemical characteristics of α-CaSi2O5, a new high pressure calcium silicate with five-coordinated silicon synthesized at 1500°C and 10 GPa",
abstract = "The crystal structure of αCaSi2O5 synthesized at conditions of 1500°C and 10 GPa, has been solved and refined in centrosymmetric space group P1, 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)°, β = 84.82(4)°, γ = 69.60(3)°, V = 329.5(3) A3, yielding the density value, 3.55 g/cm3. The structures the square-pyramid five-fold coordination of silicon by oxygen. The ionic radius for five-coordinated Si calculated from the bond distances is 0.33 A. The substantial deviation of valence sume for Ca indicates the existence of local strain and the instability of α-CaSi2O5 at room temperature.",
author = "Y. Kudoh and Masami Kanzaki",
year = "1998",
month = "6",
doi = "10.1007/s002690050132",
language = "English",
volume = "25",
pages = "429--433",
journal = "Physics and Chemistry of Minerals",
issn = "0342-1791",
publisher = "Springer Verlag",
number = "6",

}

TY - JOUR

T1 - Crystal chemical characteristics of α-CaSi2O5, a new high pressure calcium silicate with five-coordinated silicon synthesized at 1500°C and 10 GPa

AU - Kudoh, Y.

AU - Kanzaki, Masami

PY - 1998/6

Y1 - 1998/6

N2 - The crystal structure of αCaSi2O5 synthesized at conditions of 1500°C and 10 GPa, has been solved and refined in centrosymmetric space group P1, 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)°, β = 84.82(4)°, γ = 69.60(3)°, V = 329.5(3) A3, yielding the density value, 3.55 g/cm3. The structures the square-pyramid five-fold coordination of silicon by oxygen. The ionic radius for five-coordinated Si calculated from the bond distances is 0.33 A. The substantial deviation of valence sume for Ca indicates the existence of local strain and the instability of α-CaSi2O5 at room temperature.

AB - The crystal structure of αCaSi2O5 synthesized at conditions of 1500°C and 10 GPa, has been solved and refined in centrosymmetric space group P1, 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)°, β = 84.82(4)°, γ = 69.60(3)°, V = 329.5(3) A3, yielding the density value, 3.55 g/cm3. The structures the square-pyramid five-fold coordination of silicon by oxygen. The ionic radius for five-coordinated Si calculated from the bond distances is 0.33 A. The substantial deviation of valence sume for Ca indicates the existence of local strain and the instability of α-CaSi2O5 at room temperature.

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