Study on Phase Stability of Hexagonal Ba(Ti_0.95Fe_0.05)O_3-δ Ceramic via Temperature-Dependent X-Ray Diffraction

Abstract:

The crystalline structure of the hexagonal Ba (Ti_0.95Fe_0.05)O_3−δ (BTF) ceramic were directly measured using a temperature-dependent XRD technique. Different from the traditional structural transitions of rhombohedral-orthorhombic (−90 °C), orthorhombic-tetragonal (−10 °C), and tetragonal-cubic (i.e., the Curie temperature T_C = 130 °C) for BaTiO₃, the phase transition from hexagonal to any phase above for BTF cannot occur at T_C even up to 300 °C. Increasing temperature cannot give rise to the occupation of oxygen vacancies by environmental oxygen absorbed. The lattice electro-neutrality maintained by Fe³⁺-V_O-Fe³⁺ defect complexes is predominant in BTF. This experiment clarifies the phase stability of the hexagonal perovskite structure above T_C up to 300 °C.

• Periodical: Advanced Materials Research (Volume 1083)
• Pages: 55-59
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1083.55
• Online since: January 2015
• Authors: Da Yong Lu*, Yan Dong Wang, Shu Zhen Cui, Dan Dan Han
• Keywords: BaTiO₃ Ceramics, Hexagonal, Phase Stability, Temperature-Dependent X-Ray Diffraction

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