Istituto di Geoscienze e Georisorse     
Chelazzi L., Boffa Ballaran T., Lepore G., Bindi L., Bonazzi P. High-pressure behaviour of synthetic weberite-type Mn2+2Sb5+2O7: an in situ single-crystal X-ray study. In: Solid State Sciences, vol. 21 pp. 85 - 90. Elsevier, 2013.
An in situ high-pressure X-ray diffraction study has been carried out at room temperature up to 9.26 GPa on synthetic Mn2Sb2O7 having a weberite-3T structure. 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 = 782.7(2), KT0 = 150(1) GPa. Unit-cell parameters decrease gradually as a function of pressure with a bulk modulus anisotropy scheme, with a being the softest direction. The overall mean polyhedral distances are quite constant, indicating a scarce compressibility of both the A and B polyhedra in the pressure range investigated. The compressional behaviour of Mn2Sb2O7 is compared with that shown by ingersonite, Ca3MnSb4O14, and synthetic orthorhombic Ca2Sb2O7.
URL: http://www.journals.elsevier.com/solid-state-sciences/
Subject weberite
high pressure
single-crystal X-ray diffraction
thermodynamic properties

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