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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structural, magnetic, magnetocaloric and critical properties of La0.9Ba0.1MnO3 manganite
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Structural, magnetic, magnetocaloric and critical properties of La0.9Ba0.1MnO3 manganite

机译：La0.9Ba0.1mNO3锰的结构，磁，磁热和关键特性

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摘要

Polycrystalline La0.9Ba0.1MnO3 (LBMO) manganite samples are synthesized by usual solid state reaction technique. X-ray powder diffraction at room temperature indicates that our samples crystallize in the rhombohedral structure with an R (3) over barc space group. Magnetocaloric and critical behavior of the sample is probed through temperature and magnetic field dependent magnetization measurements. The compound shows paramagnetic-ferromagnetic (PM-FM) transition at critical temperature (T-C) of 280 K and the nature of this transition is of second order. The deviation in the inverse of susceptibility versus temperature plot from Curie-Weiss law near T-C unveiled the presence of Griffiths phase (GP) at T-G = 292 K with susceptibility exponent lambda = 0.3. The presence of Griffiths phase (GP) proves the existence of ferromagnetic clusters in the paramagnetic domain. Having second order phase transition sample shows a maximum magnetic entropy change (Delta S-M(max)) of 0.665 J/kg K for the magnetic field change of 4 Tesla. The sample also exhibits high relative cooling power (RCP) of 28.83 J/kg against this field. The critical behavior of second order phase transition in this sample is analyzed using Modified Arrott plots (MAP), Kouvel Fisher (KF) and critical isotherm analysis method. The estimated critical exponents of the sample are beta approximate to 0.3, gamma approximate to 1.32 and delta approximate to 5.1. These values of the critical exponents are also verified by scaling equations of state. Further the change in magnetic entropy (Delta S-M) versus applied field obeys the power law Delta S-M = (mu H-o)(n) with exponent value n = 0.55 at T-C = 280 K. (C) 2018 Published by Elsevier B.V.
机译：通过通常的固态反应技术合成多晶La0.9Ba0.1mNO3（LBMO）锰矿样品。室温下的X射线粉末衍射表明我们的样品用R（3）在Barc空间组上用R（3）结晶。通过温度和磁场相关的磁化测量探测样品的磁热和临界行为。该化合物显示了280 k的临界温度（T-C）处的顺磁 - 铁磁性（PM-FM）过渡，并且该转变的性质是二阶。在T-C附近的Curie-Weiss Lave的易感性与温度图的偏差推出了在T-G = 292K的GRIFFITHS相（GP）的存在，易感性指数Lambda = 0.3。 Griffiths阶段（GP）的存在证明了顺磁结构域中的铁磁性簇存在。具有二阶相转变样本显示为0.665J / kg k的最大磁熵变（Delta S-M（MAX）），用于4特斯拉的磁场变化。该样品还表现出对该领域的高相对冷却功率（RCP）为28.83J / kg。使用改进的arrott图（MAP），Kouvel Fisher（KF）和关键等温分析方法分析该样品中二阶相转换的临界行为。样品的估计临界指数是β近似为0.3，γ近似为1.32和三角洲近似为5.1。通过缩放状态方程还验证了关键指数的这些值。此外，磁熵（Delta S-M）的变化与施加的现场Obeys在elsevier b.v发布的T-C = 280 k的指数值n = 0.55的幂律ΔS-m =（n）（cu h-o）（n）。

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