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Ca‐substituted holmium phosphate, isomorphic with tetragonal form of HoPO4·H2O was synthesized by crystallization from boiling phosphoric acid (2 M H3PO4) solution containing 0.02M of Ho and 0–0.2 M of Ca. Calcium concentration, higher than 0.2 M Ca in solution resulted in biphasic solid crystallization: tetragonal HoPO4·H2O and orthorhombic HoPO4·2H2O. Ca incorporation in the solid according to substitution...
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