Triple-point phase diagrams for BTO-based ceramics

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2025-01-02 DOI:10.1111/jace.20366

David Gracia, François Fauth, Sara Lafuerza, Marco Evangelisti, Javier Blasco

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Abstract

The temperature–composition structural phase diagram of the BTO-based ferroelectric system Ba_0.94Ca_0.06Ti₁₋_xHf_xO₃ (0.05 ≤ x ≤ 0.15) is investigated using high-angular resolution synchrotron X-ray powder diffraction and dielectric permittivity measurements. In contrast to the well-known structural phase transition sequence of the parent compound BaTiO₃ (rhombohedral → orthorhombic → tetragonal → cubic, upon heating), Hf⁴⁺ doping into Ba_0.94Ca_0.06Ti₁₋_xHf_xO₃ results in the gradual disappearance of the intermediate orthorhombic and tetragonal phases at two different, but close, critical concentrations, 0.10 < x_c1 < 0.12 and 0.12 < x_c2 < 0.135, respectively, revealing the presence of two triple points in the phase diagram.

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.