Large magnetocaloric effects over a wide temperature range in MnCo1-xZnxGe
Large magnetocaloric effects over a wide temperature range in MnCo1-xZnxGe
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DOI：
10.1063/1.4798339
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发表时间：
2013-05-07
影响因子：
3.2
通讯作者：
Ali, Naushad
中科院分区：
文献类型：
--
作者：
Samanta, Tapas;Dubenko, Igor;Ali, Naushad
通过在 MnCo1-xZnxGe 中用 Zn 部分取代 Co，可以控制磁转变和结构转变一致，从而在较宽的温度范围内产生大的磁热效应。在 x = 0.045 的情况下，从顺磁态到铁磁态的磁结构转变导致 327K 时 Delta H = 5 T 的磁熵变化 (-Delta S-M) 为 26 J/kg K。有趣的是，在 x = 0.05 和 0.06 时观察到的两个高磁化状态之间结构驱动的一阶相变也导致 Delta H = 5 T 在 281 和 209 K 时分别具有较大的 -Delta S-M = 31.4 和 20.6 J/kg K 值。观察到的具有可调相变温度的大磁热效应使这些材料有望用于近室温磁冷却应用。 (C) 2013 年美国物理研究所。
The magnetic and structural transitions can be controlled to coincide by partial substitution of Zn for Co in MnCo1-xZnxGe, leading to a large magnetocaloric effects over a wide temperature range. The magnetostructural transition from paramagnetic to ferromagnetic state results in magnetic entropy changes (-Delta S-M) of 26 J/kg K at 327K for Delta H = 5 T in the case of x = 0.045. Interestingly, a structurally driven first-order phase transition between two high magnetization states as observed for x = 0.05 and 0.06 also lead to large values of -Delta S-M = 31.4 and 20.6 J/kg K for Delta H = 5 T at 281 and 209 K, respectively. The observed large magnetocaloric effects with tunable phase transition temperatures make these materials promising for near room-temperature magnetic cooling applications. (C) 2013 American Institute of Physics.