机械化学活化对类钙钛矿层状结构La2Ti2O7陶瓷压电性能的显著增强

IF 4.6 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: B Pub Date : 2025-02-11 DOI:10.1016/j.mseb.2025.118100

Wangxin Li , Biao Zhang , Zhihong Luo , Yu Huang , Liming Quan , Junhui Lang , Mingwang Yuan , Shuhang Yu , Xiyue Xia , Xiao Liu , Dawei Wang , Laijun Liu

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引用次数: 0

摘要

研究超高温压电传感器在现代航空航天领域的高温应用是迫切需要的。La2Ti2O7 （LTO）是一种类似钙钛矿的层状结构（PLS）陶瓷，具有约1500℃的超高居里温度（Tc），是恶劣环境中的理想材料。然而，纯LTO （~ 1.5 pC/N）的最大压电系数（d33）限制了其应用。在这项工作中，我们比较了不同的固态制备技术，并开发了一种机械化学活化方法（LTO- map）来提高LTO陶瓷的电学性能。LTO-MAP陶瓷表现出优异的室温d33 (~ 4.6 pC/N)，比以前的研究显著提高了307%。这种增强可以归因于单畴晶粒减小和畴尺寸增大的综合影响。在800℃时，其电阻率ρdc为2.1 × 107 Ω·cm，是lto基陶瓷中最高的。本文提出了一种提高LTO陶瓷性能的创新工艺，为生产LTO陶瓷提供了一种简单、经济的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Significant enhancement of piezoelectric properties by mechanochemical activation in perovskite-like layered structure La2Ti2O7 ceramics

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Significant enhancement of piezoelectric properties by mechanochemical activation in perovskite-like layered structure La2Ti2O7 ceramics

There is a critical need to explore ultra-high temperature piezoelectric sensors for high-temperature applications in modern aerospace field. La₂Ti₂O₇ (LTO) is a perovskite-like layered structure (PLS) ceramic with a super-high Curie temperature (T_c) of about 1500 °C, making it ideal in harsh environment. Nevertheless, the maximum piezoelectric coefficient (d₃₃) of pure LTO (∼1.5 pC/N) limits its application. In this work, we compared different solid-state preparing techniques and developed a mechanochemical activation method (LTO-MAP) to enhance the electrical properties of LTO ceramics. LTO-MAP ceramics exhibit an excellent room temperature d₃₃ (∼4.6 pC/N), which is a significant improvement of 307 % over previous studies. This enhancement can be ascribed to the combined impact of single-domain grain reduction and an augmentation in domain size. Furthermore, it demonstrates a high electrical resistivity (ρ_dc) of 2.1 × 10⁷ Ω·cm at 800 °C, the highest among LTO-based ceramics. This work presents an innovative process to enhance the performance of LTO ceramics, offering a straightforward and cost-effective method for producing LTO ceramics.

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来源期刊

Materials Science and Engineering: B 工程技术-材料科学：综合

CiteScore

5.60

自引率

2.80%

发文量

481

审稿时长

3.5 months

期刊介绍： The journal provides an international medium for the publication of theoretical and experimental studies and reviews related to the electronic, electrochemical, ionic, magnetic, optical, and biosensing properties of solid state materials in bulk, thin film and particulate forms. Papers dealing with synthesis, processing, characterization, structure, physical properties and computational aspects of nano-crystalline, crystalline, amorphous and glassy forms of ceramics, semiconductors, layered insertion compounds, low-dimensional compounds and systems, fast-ion conductors, polymers and dielectrics are viewed as suitable for publication. Articles focused on nano-structured aspects of these advanced solid-state materials will also be considered suitable.