| Abstrakt: |
BiFe2(PO4)3 and Bi1–xSbхCr2(PO4)3 (0 < x < 1) solid solutions, isostructural with α‑CaMg2(SO4)3 (sp. gr. P63/m), have been prepared via boiling down a salt solution, followed by heat treatment, and characterized by X-ray powder diffraction and electron probe X-ray microanalysis. Using variable temperature X-ray diffraction, we have determined thermal expansion parameters of the phosphates in the range from 173 to 473 K. As the temperature is varied, the phosphates expand anisotropically, without polymorphic transitions. BiFe2(PO4)3 and the Bi1–xSbхCr2(PO4)3 solid solutions are low-expansion materials, with average linear thermal expansion coefficients αav below 2 × 10–6 K–1. [ABSTRACT FROM AUTHOR] |
