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In‐situ high‐pressure powder X‐ray diffraction study of α‐zirconium phosphate
Author(s) -
Readman Jennifer E.,
Lennie Alistair,
Hriljac Joseph A.
Publication year - 2014
Publication title -
acta crystallographica section b
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.604
H-Index - 33
ISSN - 2052-5206
DOI - 10.1107/s2052520614011317
Subject(s) - diffraction , bulk modulus , zirconium phosphate , materials science , x ray crystallography , zirconium , powder diffraction , hydrostatic pressure , rietveld refinement , phosphate , titanium , crystallography , hydrostatic equilibrium , compressibility , analytical chemistry (journal) , crystal structure , chemistry , composite material , thermodynamics , metallurgy , optics , chromatography , organic chemistry , physics , quantum mechanics
The high‐pressure structural chemistry of α‐zirconium phosphate, α‐Zr(HPO 4 ) 2 ·H 2 O, 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.