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Hydrothermal Syntheses and Structural Phase Transitions of AgNbO 3
Author(s) -
Chang Haibo,
Shang Mingyu,
Zhang Chenyang,
Yuan Hongming,
Feng Shouhua
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05392.x
Subject(s) - orthorhombic crystal system , hydrothermal circulation , crystallography , phase (matter) , hydrothermal synthesis , crystal structure , materials science , diffraction , powder diffraction , lattice (music) , x ray crystallography , chemistry , space group , chemical engineering , optics , engineering , physics , organic chemistry , acoustics
The phase‐pure AgNbO 3 has been prepared through the hydrothermal reactions of NH 4 HF 2 , Ag 2 O , and Nb 2 O 5 . The room‐temperature powder X ‐ray diffraction analysis reveals that it crystallizes in orthorhombic perovskite lattice with a space group of Pmc 2 1 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 .