Abstract A comprehensive study of structural, magnetic and magnetocaloric properties in the ternary Prussian blue analogue (PBA) Ni1.5[Fe(CN)6]x[Cr(CN)6]1-x·nH2O (x = 0, 0.25, 0.5, 0.75 and 1) is presented. For all compounds the second-order magnetic phase transition from high temperature paramagnetic to the low temperature ferromagnetic state at the Curie temperature (Tc) is observed. We show the possibility of tuning the magnetic and magneto-caloric properties of PBA materials by changing the compositional factor of the metal centres involved in the cyano-bridging. An increase in Fe content leads to increase in the coercive field, whereas the critical temperature decreases from 60 to 22 K. The magnetic entropy change ΔS, as well as the related Relative Cooling Power (RCP), vary with x parameter in the regular way. The highest value of ΔS was observed for sample with x = 1 and was equal to 3.49 J mol−1K−1 under a magnetic field of 50 kOe, whereas the RCP varied from 62 J mol−1 (145.35 J kg−1) to 118 J mol−1 (273.33 J kg−1), when x decreased from 1 to 0.

中文翻译：

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三元普鲁士蓝类似物的可调临界温度和磁热效应

摘要 三元普鲁士蓝类似物 (PBA) Ni1.5[Fe(CN)6]x[Cr(CN)6]1-x·nH2O (x = 0, 0.25, 0.5、0.75 和 1)。对于所有化合物，在居里温度 (Tc) 下观察到从高温顺磁态到低温铁磁态的二阶磁相变。我们展示了通过改变氰基桥接中涉及的金属中心的组成因子来调整 PBA 材料的磁性和磁热性能的可能性。Fe 含量的增加导致矫顽场增加，而临界温度从 60 K 降低到 22 K。磁熵变 ΔS 以及相关的相对冷却功率 (RCP) 以规则方式随 x 参数变化.