High-pressure behavior of the synthetic Ca2Sb2O7 weberite-type compound

Chelazzi, L.; Boffa Ballaran, T.; Nestola, F.; Bindi, Luca; Bonazzi, Paola

doi:10.1016/j.solidstatesciences.2011.01.013

An in situ high-pressure X-ray diffraction study has been carried out at room temperature up to 9.23 GPa on a crystal of Ca2Sb2O7 having a weberite-2O structure synthesized by solid-state reaction. A 2nd-order Birch-Murnaghan Equation of State (EoS) was used to refine the pressure-volume data. The refinement of the unit-cell volume and of the isothermal bulk modulus at room pressure leads to: V0 = 555.8(1), KT0 = 154.6(9) GPa. Unit-cell parameters decrease gradually as a function of pressure with a bulk modulus anisotropy scheme Ka0 > Kb0 > Kc0, with c being the softest direction. The compressional behavior of Ca2Sb2O7 is compared with that shown by ingersonite, Ca3MnSb4O14, a mineral showing a weberite-3T structure.

High-pressure behavior of the synthetic Ca2Sb2O7 weberite-type compound / L. Chelazzi; T. Boffa Ballaran; F. Nestola; L. Bindi; P. Bonazzi. - In: SOLID STATE SCIENCES. - ISSN 1293-2558. - ELETTRONICO. - 13:(2011), pp. 1092-1095. [10.1016/j.solidstatesciences.2011.01.013]