标题： 杂质引起的三元化合物中的化学压力 Eu$T_2Pn_2$ ($T =$ Cd, Zn; $Pn =$ P, As, Sb) 显示英文标题

标题： Chemical pressure due to impurities in trigonal compounds Eu$T_2Pn_2$ ($T =$ Cd, Zn; $Pn =$ P, As, Sb)

摘要： 这项工作综述了三元金属间化合物系统Eu$T_2Pn_2$ ($T=$ Cd, Zn; $Pn=$ P, As, Sb; 空间群$P\overline{3}m1$，编号164)家族中的晶体生长、晶体结构、成分细节、磁性、热力学和输运行为。讨论了这些材料中观察到的物理性质以及这些性质如何根据生长条件发生变化。特别是考虑了EuCd$_2$As$_2$的情况，因为来自多个来源的数据是可用的。在晶体生长实验中，材料可能受到少量污染，但很难验证，因为这通常低于标准表征技术的检测限。结果表明，不同来源的样品在晶格参数上存在变化，超过了实验误差。 这些参数的综述表明，从Sn通量在Al$_2$O$_3$坩埚中生长的反铁磁样品它们非常相似，而从盐通量在SiO$_2$安瓿中生长的样品则有更广的分布，这些样品大多是铁磁性的。 关于不同实验装置对样品中可能杂质的影响进行了讨论。 显示英文摘要

摘要： This work provides a review of crystal growth, crystal structure, compositional details, magnetism, thermodynamic, and transport behavior in the family of the trigonal intermetallic systems Eu$T_2Pn_2$ ($T=$ Cd, Zn; $Pn=$ P, As, Sb; space group $P\overline{3}m1$, No.164). The physical properties observed in these materials, and how these change depending on the growth conditions are discussed. In particular, the case of EuCd$_2$As$_2$ is considered where data from many sources are available. The possible small contamination of the material during crystal growth experiments is hard to verify as it is often below the detection limit of the standard characterization techniques. It turns out that samples from different sources exhibit variations in the lattice parameters exceeding the experimental errors. The review of these parameters reveals that they are very similar for antiferromagnetic samples grown from Sn flux in Al$_2$O$_3$ crucibles, while there is a wider spread for samples grown from salt flux grown in SiO$_2$ ampules, which are mostly ferromagnetic. The influence of the different experimental setups with regard to possible impurities in the samples is discussed.