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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 >Synthesis and on-line ultrasonic characterisation of bulk and nanocrystalline La_(0.68)Sr_(0.32)MnO_3 perovskite manganite
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Synthesis and on-line ultrasonic characterisation of bulk and nanocrystalline La_(0.68)Sr_(0.32)MnO_3 perovskite manganite

机译：块状纳米La_（0.68）Sr_（0.32）MnO_3钙钛矿锰矿的合成及在线超声表征

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摘要

La_(0.68)Sr_(0.32)MnO_3 perovskite manganite samples were prepared using sonochemical reactor and solid state reaction technique. The ultrasonic velocity, attenuation and elastic moduli of samples were measured using ultrasonic through transmission method, at a fundamental frequency of 5 MHz over a wide range of temperatures. The temperature dependence of the ultrasonic parameters shows an interesting anomaly in all the compositions. The observed dramatic softening and hardening in sound velocities or attenuation is related to phase transitions. The linear magnetostriction effect is more dominant in the perovskite than volume magnetostriction effect which is evident from the observed anomalous in both longitudinal and shear velocities and attenuation. Further, a decrease in grain size in the sintered sample leads to a shift in the ferromagnetic transition temperature (T_C) from 375 to 370 K.
机译：采用声化学反应器和固态反应技术制备了La_（0.68）Sr_（0.32）MnO_3钙钛矿锰矿样品。使用超声波通过传输方法在5 MHz的基本频率和较宽的温度范围内测量样品的超声速度，衰减和弹性模量。超声参数的温度依赖性在所有组合物中均表现出有趣的异常。所观察到的声速或衰减的剧烈软化和硬化与相变有关。钙钛矿中的线性磁致伸缩效应比体积磁致伸缩效应更为显着，这从纵向和剪切速度以及衰减的异常都可以看出。此外，烧结样品中晶粒尺寸的减小会导致铁磁转变温度（T_C）从375 K转变为370K。

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