Flux Growth of Cerium Nickel Gallides Studied by In Situ Neutron Diffraction
Flux Growth of Cerium Nickel Gallides Studied by In Situ Neutron Diffraction
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原位中子衍射研究铈镍镓化物的通量增长
DOI：
10.1021/acs.inorgchem.2c02588
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发表时间：
2022
影响因子：
4.6
通讯作者：
Latturner, Susan E.
中科院分区：
文献类型：
--
作者：
Haddock, Jo W.;Barton, Zach J.;Feng, Keke;Baumbach, Ryan E.;Zhang, Qiang;Latturner, Susan E.
在加热和冷却过程中，用中子衍射法监测了铈和镍在过量熔融镓中的反应。在加热过程中观察到二元中间体CeGa 2和Ni 2Ga 3的形成。在熔融混合物从900 °C冷却期间，在850 °C下发生BaAl 4型CeNi0.74Ga3.26的沉淀。在冷却至650 °C时，该化合物在熔剂中反应形成Ce 2NiGa 10，然后形成Ce 2NiGa 12，后者持续至室温。利用该信息，随后的反应在750 °C下淬灭以分离CeNi0.74Ga3.26的晶体用于进一步研究。类似的反应用La代替Ce并在750 °C以上淬火产生LaNi 0.35Ga 3.65晶体。对CeNi_（0.74）Ga_（3.26）的磁化率研究表明，Ce为三价，Ce ~（3+）的磁矩在低于7 K时呈现强各向异性的铁磁有序，磁矩垂直于轴。热容量数据显示，几乎没有证据表明重费米子的行为。电阻率测量表明LaNi 0.35Ga 3.65和CeNi0.74Ga 3.26都表现出金属性。态密度的计算支持这一点，并表明，Ni/Ga混合的化合物稳定的结构。
Reactions of cerium and nickel in excess molten gallium were monitored by neutron diffraction during heating and cooling. The formation of binary intermediates CeGa2and Ni2Ga3was observed during heating. During cooling of the molten mixture from 900 °C, precipitation of BaAl4-type CeNi0.74Ga3.26occurred at 850 °C. Upon cooling to 650 °C, this compound reacted in the flux to form Ce2NiGa10and then Ce2NiGa12, the latter of which persisted to room temperature. Making use of this information, subsequent reactions were quenched at 750 °C to isolate crystals of CeNi0.74Ga3.26for further study. Similar reactions replacing Ce with La and quenching above 750 °C yielded LaNi0.35Ga3.65crystals. Magnetic susceptibility studies on CeNi0.74Ga3.26indicate that the cerium is trivalent; the Ce3+moments undergo a strongly anisotropic ferromagnetic ordering with moment perpendicular to thecaxis below 7 K. Heat capacity data show little evidence of heavy fermion behavior. Resistivity measurements show that both LaNi0.35Ga3.65and CeNi0.74Ga3.26exhibit metallic behavior. Density of states calculations support this and indicate that Ni/Ga mixing in the compound stabilizes the structure.