Abstract
The phase‐pure AgNbO3 has been prepared through the hydrothermal reactions of NH4HF2, Ag2O, and Nb2O5. The room‐temperature powder X‐ray diffraction analysis reveals that it crystallizes in orthorhombic perovskite lattice with a space group of Pmc21 and cell parameters a = 15.6999(9), b = 5.5521(1), and c = 5.5830(1) Å. The temperatures, pH values, and times play crucial roles in obtaining phase‐pure silver niobate. The structural phase transitions were observed at 813 K from cubic to tetrahedral phase and to final orthorhombic phase at 718 K, confirmed by TGA‐DTA.
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