Composition-dependent structural, microstructural and functional characteristics of fine-grained BaTi1-xHfxO3 ceramics consolidated by Spark Plasma Sintering

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-06-06 DOI:10.1016/j.jeurceramsoc.2025.117600

Elena Mirabela Soare , Cătălina-Andreea Stanciu , Roxana Elena Pătru , Vasile-Adrian Surdu , Nadejda Horchidan , Liliana Mitoşeriu , Ioana Pintilie , Bogdan Ştefan Vasile , Adrian-Ionuţ Nicoară , Roxana Doina Truşcă , Adelina-Carmen Ianculescu

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引用次数: 0

Abstract

The functional properties of BaTi_1-xHf_xO₃ (0 ≤x ≤ 0.20) ceramics consolidated by spark plasma sintering from Pechini nanopowders are discussed in terms of the synergic effect of overlapping dissimilar structural modifications, nanoscale grain size reduction and ferroelectric-relaxor crossover. Structural and Raman investigations revealed the coexistence of various polymorph modifications. The main effects of Hf addition are: (i) a strong inhibiting of the grain growth process, (ii) the reduction of T_C and increase of the orthorhombic-tetragonal and rhombohedral-orthorhombic transition temperatures until a single, "pinched" and diffuse ferroelectric-paraelectric phase transition occurs, (iii) a strong flattening of the permittivity maximum, (iv) a slight decrease of the grain boundary resistivity, but still allowing the application of high a.c. and d.c. fields and (v) a gradual reduction of polarization, hysteresis loops area, energy storage capability and tunability values. Based on the dielectric and thermo-Raman results, a new low-temperature phase diagram of the fine-grained BaTi_1-xHf_xO₃ ceramics is proposed.

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火花等离子烧结细晶BaTi1-xHfxO3陶瓷的成分依赖性结构、微观结构和功能特性

从不同结构修饰叠加、纳米级晶粒尺寸减小和铁电弛豫交叉的协同效应等方面讨论了Pechini纳米粉体火花等离子烧结复合的BaTi1-xHfxO3（0 ≤x ≤ 0.20）陶瓷的功能特性。结构和拉曼研究揭示了各种多晶型修饰的共存。加入Hf的主要影响有：(i)对晶粒生长过程有很强的抑制作用，（ii） TC的降低和正交-四边形和菱形-正交转变温度的增加，直到发生单一的“挤压”和漫射铁电-准电相变，（iii）介电常数最大值的强烈平坦化，（iv）晶界电阻率略有降低，但仍允许使用高交流和直流电场，(v)极化逐渐减少。迟滞回路面积、储能能力和可调性值。基于介电和热拉曼结果，提出了一种新的细晶BaTi1-xHfxO3陶瓷的低温相图。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.