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Therman Expansion and Crystal Chemistry of (Sr 1− x , K 2 x )Zr 4 (PO 4 ) 6 Ceramic
Author(s) -
Liu D.M.,
Lin L.J.,
Chen C.J.
Publication year - 1995
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889894013968
Subject(s) - dilatometer , thermal expansion , diffractometer , ceramic , materials science , analytical chemistry (journal) , lattice constant , crystal structure , mineralogy , anisotropy , x ray crystallography , strontium , crystallography , diffraction , chemistry , composite material , physics , chromatography , quantum mechanics , optics , organic chemistry
Thermal expansion of (Sr 1− x , K 2 x )Zr 4 (PO 4 ) 6 (SrKZP) (with x = 0–1) ceramic was investigated using both a dilatometer and a high‐temperature X‐ray diffractometer. The coefficients of thermal expansion (CTEs) of the SrKZP ceramic measured by the dilatometer demonstrate a similar trend as those from high‐temperature X‐ray diffraction. Both measurements show an ultra‐low CTE at x = 0.5; nevertheless, this composition shows significant lattice thermal‐expansion anisotropy (TEA), while the minimum TEA appears with composition x = 0.2. Although it possessed a sufficient degree of TEA, the x = 0.5 composition showed no visible microcracks or negligible microcracks over a grain size as large as 15 μm. A transition of space group from R to R c with composition between x = 0.3 and x = 0.5 has been observed. The crystal structure of the SrKZP ceramic with possible occupations of strontium and/or potassium within the lattice in relation to their influence on the CTEs is proposed.