TbPdAl2 and the solid solution Tb1-xLuxPdAl2 (x = 0.1-1) have been synthesized via arc-melting techniques using the elements as starting materials and crystallize in the orthorhombic MgCuAl2-type structure (Cmcm). As expected, the unit cell volumes decrease due to the lanthanide contraction from the Tb to Lu compounds, thus showing Vegard behavior because of the differences of the ionic radii of the trivalent rare-earth cations. TbPdAl2 orders ferromagnetically below TC = 85.5(5) K and shows partial magnetic saturation already at low fields. The magnetic phase transition has been additionally investigated by heat capacity measurements, showing a broadened λ anomaly at THC = 83.2(1) K. The electrical resistivity is almost linear above TC, indicating dominant electron-phonon interactions. Below the ordering temperature, electron-spin wave scattering with a ρ ∼ T2 behavior is evident. In the solid solution Tb1-xLuxPdAl2 (x = 0-1), the ferromagnetic Curie temperatures decrease in a linear fashion with increasing Lu content. Investigations of the magnetocaloric properties of TbPdAl2 obtained a maximum magnetic entropy change of -ΔSMmax = 1.2, 2.2, 3.1, and 3.6 J kg-1 K-1 for the field changes of ΔH = 10, 20, 50, and 70 kOe, respectively. The rather low values are caused by entropy losses due to hysteresis behavior. The relative cooling power for TbPdAl2, therefore, also exhibits comparably low values of 32, 81, 142, and 178 J kg-1.

中文翻译：

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TbPdAl2和铁磁固溶体Tb1-xLuxPdAl2（x = 0.1-0.9）的物理和磁热性质。

TbPdAl2和固溶体Tb1-xLuxPdAl2（x = 0.1-1）已通过电弧熔化技术以元素为原料合成，并在正交MgCuAl2型结构（Cmcm）中结晶。如预期的那样，由于镧系元素从Tb到Lu化合物的收缩，单位晶胞体积减小，由于三价稀土阳离子的离子半径不同，因此显示出Vegard行为。TbPdAl2在TC = 85.5（5）K以下时呈铁磁有序，并且在低磁场下已经显示出部分磁饱和。磁相变已通过热容测量进行了进一步研究，显示出在THC = 83.2（1）K时λ异常变宽。电阻率在TC之上几乎呈线性，表明主要的电子-声子相互作用。低于订购温度，电子自旋波散射具有ρ〜T2行为。在固溶体Tb1-xLuxPdAl2（x = 0-1）中，铁磁性居里温度随着Lu含量的增加呈线性下降。对TbPdAl2的磁热性质的研究分别获得了ΔH= 10、20、50和70 kOe的最大磁场熵变-ΔSMmax= 1.2、2.2、3.1和3.6 J kg-1 K-1。 。相当低的值是由于磁滞行为引起的熵损失引起的。因此，TbPdAl2的相对冷却功率也表现出相对较低的32、81、142和178 J kg-1值。对TbPdAl2的磁热性质的研究分别获得了ΔH= 10、20、50和70 kOe的最大磁场熵变-ΔSMmax= 1.2、2.2、3.1和3.6 J kg-1 K-1。 。相当低的值是由于磁滞行为引起的熵损失引起的。因此，TbPdAl2的相对冷却功率也表现出相对较低的32、81、142和178 J kg-1值。对TbPdAl2的磁热性质的研究分别获得了ΔH= 10、20、50和70 kOe的最大磁场熵变-ΔSMmax= 1.2、2.2、3.1和3.6 J kg-1 K-1。 。相当低的值是由于磁滞行为引起的熵损失引起的。因此，TbPdAl2的相对冷却功率也表现出相对较低的32、81、142和178 J kg-1值。