Structural, dielectric, and ferroelectric characteristics of the low-temperature sintered 65PMN-35PT sample for electroceramic applications

IF 2.7 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Electroceramics Pub Date : 2025-07-08 DOI:10.1007/s10832-025-00423-y

Ramachandran Balakrishnan, Sudarshan Narayanan, Mangamma Geramilla, Mamidanna S. Ramachandra Rao

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Abstract

A single-phase 0.65PbMg_1/3Nb_2/3O₃-0.35PbTiO₃ (65PMN-35PT) ceramic was synthesized at a relatively low temperature (875 ^oC) using a modified columbite method. X-ray diffraction analysis confirmed the single-phase formation of perovskite 65PMN-35PT with a tetragonal structure. Morphological studies indicated that the sample consisted of small grains with a size of ≤ 2 µm. The dielectric properties of the material demonstrate its relaxor behavior near the ferroelectric transition temperature, T_C = 457 K. The saturation and remnant polarization values of approximately 25.9 and 20.1 µC cm⁻² were achieved for an electrically poled sample. Additionally, the poling induced a negative internal electric field of about − 0.2 kV cm⁻¹ was detected due to the presence of ferroelectric nano-grains in this bulk 65PMN-35PT sample. These observed characteristics of the pyrochlore-free 65PMN-35PT ceramic are similar to those of its single-crystal counterpart.

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低温烧结65PMN-35PT电陶瓷样品的结构、介电和铁电特性

在较低温度（875℃）下，采用改良柱状体法制备了单相0.65 pbg1 / 3nb2 / 3o3 -0.35 pbtio3 （65PMN-35PT）陶瓷。x射线衍射分析证实了65PMN-35PT钙钛矿的单相形成，具有四方结构。形态学研究表明，样品由粒径≤2µm的小颗粒组成。在铁电转变温度（TC = 457 K）附近，材料的介电性能表现出弛豫特性。电极化样品的饱和和剩余极化值分别约为25.9µC和20.1µC cm−2。此外，由于铁电纳米颗粒的存在，在该大块65PMN-35PT样品中检测到极化诱导的负内部电场约为- 0.2 kV cm - 1。这些观察到的无焦绿石65PMN-35PT陶瓷的特征与单晶陶瓷相似。

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来源期刊

Journal of Electroceramics 工程技术-材料科学：硅酸盐

CiteScore

2.80

自引率

5.90%

发文量

审稿时长

5.7 months

期刊介绍： While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including: -insulating to metallic and fast ion conductivity -piezo-, ferro-, and pyro-electricity -electro- and nonlinear optical properties -feromagnetism. When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice. The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.