Investigation of Magnetocaloric Behavior of Nanocrystalline Nd0.67A0.33MnO3, (A = Ca, Sr, Ba and Pb)
Investigation of Magnetocaloric Behavior of Nanocrystalline Nd0.67A0.33MnO3, (A = Ca, Sr, Ba and Pb)
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纳米晶 Nd0.67A0.33MnO3 磁热行为的研究（A = Ca、Sr、Ba 和 Pb）
DOI：
10.1007/s10948-014-2543-y
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发表时间：
2014
影响因子：
1.8
通讯作者：
P. V. Reddy
中科院分区：
文献类型：
--
作者：
E. Sagar;N. Kumar;D. Krishna;P. V. Reddy
采用PVA凝胶法制备了纳米晶形式的超磁阻（CMR）材料，其组成式为Nd0.67A0.33MnO3（其中a = Ca, Sr, Ba, Pb）。在对样品进行结构表征后，在0.05 T磁场下，在10-300 K的温度范围内进行了系统的磁化研究。利用实验磁化数据，从理论上计算了所有样品的磁热行为。其他重要参数如最大熵变、半最大全宽度、相对冷却功率和0.05 T下的最大绝热温度变化也进行了计算。所观察到的行为已得到定性解释。
Colossal magnetoresistive (CMR) materials with the compositional formula, Nd0.67A0.33MnO3(whereA= Ca, Sr, Ba, and Pb) in the nanocrystalline form were prepared by the PVA gel technique. After characterizing the samples structurally, a systematic investigation of magnetization has been undertaken, over a temperature range 10–300 K at 0.05 T magnetic field. An effort has been made to calculate the magnetocaloric behavior of all the samples theoretically using the experimental magnetization data. Other important parameters such as maximum entropy change, full width at half-maximum, relative cooling power, and maximum adiabatic temperature change under 0.05 T were also computed. The observed behavior has been explained qualitatively.