In-situ high-pressure powder X-ray diffraction study of α -zirconium phosphate

Readman, Jennifer Elizabeth orcid iconORCID: 0000-0002-8170-5533, Lennie, Alistair and Hrilijac, Joseph A (2014) In-situ high-pressure powder X-ray diffraction study of α -zirconium phosphate. Acta Crystallographica Section B, B70 . pp. 510-516. ISSN 2052-5206

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The high-pressure structural chemistry of -zirconium phosphate, -Zr(HPO4) 2H2O, was studied using in-situ high-pressure diffraction and synchrotron radiation. The layered phosphate was studied under both hydrostatic and non-hydrostatic conditions and Rietveld refinement carried out on the resulting diffraction patterns. It was found that under hydrostatic conditions no uptake of additional water molecules from the pressure-transmitting medium occurred, contrary to what had previously been observed with some zeolite materials and a layered titanium phosphate. Under hydrostatic conditions the sample remained crystalline up to 10 GPa, but under non-hydrostatic conditions the sample amorphized between 7.3 and 9.5 GPa. The calculated bulk modulus, K 0 = 15.2 GPa, showed the material to be very compressible with the weak linkages in the structure of the type Zr—O—P.

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