Low field magnetoelectric studies on sol–gel grown nanostructured YMnO3 manganites

IF 9.1 2区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR Progress in Solid State Chemistry Pub Date : 2018-03-01 DOI:10.1016/j.progsolidstchem.2017.12.001

Zalak Joshi , Davit Dhruv , K.N. Rathod , Hetal Boricha , Keval Gadani , D.D. Pandya , A.D. Joshi , P.S. Solanki , N.A. Shah

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引用次数: 37

Abstract

Single phasic nanostructured YMnO₃ manganites were successfully synthesized by employing acetate precursor based modified sol–gel technique followed by their sintering at different temperatures. Structural studies were carried out by performing X–ray diffraction (XRD) measurement and Rietveld analysis on raw data of XRD. Particle size and shape were studied using transmission electron microscopy (TEM) while size distribution was investigated by performing particle size analyzer. Nanostructured samples were studied for their electrical properties under low applied magnetic field of 1.2T. Frequency and magnetic field dependent dielectric behavior has been understood on the basis of boundaries between the particles and inverse Dzyaloshinskii–Moriya (DM) interaction. Nanostructured YMnO₃ manganites exhibit positive magnetodielectric (MD) effect. Universal dielectric response (UDR) model and relaxation mechanism have been employed for dielectric behavior of the samples understudy. Role of particle morphology and magnetic disorder have been discussed for the understanding of impedance and negative magnetoimpedance (MI) of the samples. Frequency and magnetic field dependent variation in conductivity has been explained using boundary and magnetic disorders and free charge carriers in the samples. All nanostructured YMnO₃ show positive Magnetoconductivity (MC) throughout the frequency and magnetic field range studied. Variation in voltage dependent hysteretic capacitance and estimated built–in potential have been discussed in the context of the role of defects, vacancies, disorder and free charge carriers in the samples sintered at different temperatures.

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溶胶-凝胶生长纳米结构YMnO3锰矿石的低场磁电研究

采用醋酸前驱体改性溶胶-凝胶技术，在不同温度下烧结，成功合成了单相纳米YMnO3锰矿石。通过x射线衍射(XRD)测量和对XRD原始数据的Rietveld分析进行了结构研究。采用透射电子显微镜(TEM)研究了颗粒的大小和形状，并用粒度分析仪研究了颗粒的分布。研究了纳米结构样品在1.2T低外加磁场下的电学性能。基于粒子之间的边界和逆Dzyaloshinskii-Moriya (DM)相互作用，已经理解了频率和磁场依赖的介电行为。纳米结构的YMnO3锰矿石表现出正磁介电效应。采用通用介电响应(UDR)模型和弛豫机制研究了所研究样品的介电行为。为了更好地理解样品的阻抗和负磁阻抗(MI)，讨论了颗粒形态和磁性无序的作用。电导率的频率和磁场依赖性变化已经用边界和磁性紊乱以及样品中的自由载流子来解释。在所研究的频率和磁场范围内，所有纳米结构的YMnO3都表现出正的磁导率(MC)。本文讨论了在不同温度下烧结样品中缺陷、空位、无序和自由载流子的作用，讨论了电压依赖性滞后电容和估计内置电位的变化。

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来源期刊

Progress in Solid State Chemistry 化学-无机化学与核化学

CiteScore

14.10

自引率

3.30%

发文量

期刊介绍： Progress in Solid State Chemistry offers critical reviews and specialized articles written by leading experts in the field, providing a comprehensive view of solid-state chemistry. It addresses the challenge of dispersed literature by offering up-to-date assessments of research progress and recent developments. Emphasis is placed on the relationship between physical properties and structural chemistry, particularly imperfections like vacancies and dislocations. The reviews published in Progress in Solid State Chemistry emphasize critical evaluation of the field, along with indications of current problems and future directions. Papers are not intended to be bibliographic in nature but rather to inform a broad range of readers in an inherently multidisciplinary field by providing expert treatises oriented both towards specialists in different areas of the solid state and towards nonspecialists. The authorship is international, and the subject matter will be of interest to chemists, materials scientists, physicists, metallurgists, crystallographers, ceramists, and engineers interested in the solid state.