In situ Raman and electric modulus study of NBT-ST-KNN ceramics: An insight into temperature evolution of relaxor dynamics

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-04-30 DOI:10.1016/j.materresbull.2025.113534

Arpita Singha , Swetapadma Praharaj , Dibyaranjan Rout

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引用次数: 0

Abstract

Polar nanoregions (PNRs) are often argued to be the key factor in enhancing the functional properties of relaxor-based ferroelectrics. The creation and relaxation of these polar entities are believed to be strongly temperature-dependent, but the explanation is still unclear. In this investigation we have chosen a well-established relaxor system (0.8-x)(Na_0.5Bi_0.5)TiO₃-0.2SrTiO₃-x(K_0.5Na_0.5)NbO₃; (x = 0.005, 0.01, 0.04 and 0.1) to probe into the thermal dynamics of PNRs using in-situ Raman and electric modulus formalism. The Raman spectra segregate into different temperature zones corresponding to ferroelectric-relaxor transition (T_F-R), maximum dielectric constant (T_m) and Burn’s temperature (T_B). A closer introspection of width and position of peak peaks around these temperatures depicts the existence of local structural heterogeneities. Further, the frequency-dependent electric modulus, M"(f)

study demarcates high-frequency shoulder (related to PNR relaxation) from intermediate frequency peak corresponding to bulk response. Analysis of Z"(f) and M"(f) predict temperature evolution of long-range ordered regions to localized relaxations.

Abstract Image

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NBT-ST-KNN陶瓷的原位拉曼和电模量研究：弛豫动力学的温度演化

极性纳米区（PNRs）通常被认为是增强弛豫基铁电体功能特性的关键因素。这些极地实体的产生和弛豫被认为是强烈依赖于温度的，但解释仍然不清楚。在这项研究中，我们选择了一个完善的弛豫系统（0.8-x）（Na0.5Bi0.5）TiO3-0.2SrTiO3-x(K0.5Na0.5)NbO3；（x = 0.005, 0.01, 0.04和0.1），利用原位拉曼和电模形式探讨PNRs的热动力学。拉曼光谱根据铁电弛豫跃迁（TF-R）、最大介电常数（Tm）和Burn温度（TB）划分为不同的温度区。对这些温度附近峰的宽度和位置进行更近距离的自省，可以描述局部结构非均质性的存在。此外，频率相关的电模量M”(f)研究将高频肩（与PNR弛豫有关）与体响应对应的中频峰区分开来。Z′(f)和M′(f)的分析预测了长程有序区向局域弛豫的温度演化。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.