Abstract
Erbium zirconium phosphate Er0.33Zr2(PO4)3, a member of the family of structural analogs of NaZr2(PO4)3 (NZP), was prepared by the sol-gel process and studied by X-ray phase analysis, IR spectroscopy, and differential scanning calorimetry. The behavior of erbium zirconium phosphate on heating in the temperature interval from 25 to 625°C was studied by high-temperature X-ray diffraction. Expansion and contraction along different crystallographic directions and contraction of the structure as a whole were found. The overall contraction is due to higher contribution of the negative axial thermal expansion coefficients αa and αb to αav and hence to the volume expansion of the phosphate. On heating to 900°C, the NZP structure is preserved.
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