Hydrothermal Syntheses and Structural Phase Transitions of AgNbO3

Authors

  • Haibo Chang,

    1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China
    2. Resource and Environment Department, Jilin Agriculture University, Changchun, China
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  • Mingyu Shang,

    1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China
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  • Chenyang Zhang,

    1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China
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  • Hongming Yuan,

    Corresponding author
    • State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China
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  • Shouhua Feng

    1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, China
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Author to whom correspondence should be addressed. e-mail: hmyuan@jlu.edu.cn

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 = 15.6999(9), = 5.5521(1), and = 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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