Crystal growth and magnetic properties of Pr 3 Co 2+x Ge 7 and the Sn-stabilized Ln 3 Co 2+x Ge 7−y sn y (Ln = Pr, Nd, Sm)

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Single crystals of the ternary Pr 3 Co 2+x Ge 7 and Ln 3 Co 2+x Ge 7 − y Sn y (Ln = Pr, Nd, Sm) adopting a disordered version of the La 3 Co 2 Sn 7 structure type have been prepared via flux-growth methods and characterized by single crystal X-ray diffraction. The structure consists of two lanthanide crystallographic sites with one occupying a cuboctahedral coordination environment and a second in a trigonal prismatic environment. The structure can also be described as an intergrowth of AuCu 3 and CeNiSi 2 structure types, and the stability of the germanide analogues requires Sn incorporation and Co site preferences. Magnetic properties of the Pr 3 Co 2+x Ge 7 − y Sn y series are highlighted with the Sn-substituted Pr 3 Co 2.514(5) Ge 6.66(7) Sn 0.360(2) orders magnetically near 5.8 K, while the germanide Pr 3 Co 2.3376(5) Ge 7.056(7) exhibits magnetic transitions at 5.3 and 9.3 K, arising from the magnetic sublattices with field-dependent magnetization revealing three metamagnetic transitions at 0.46, 0.80, and 2.1 T.

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Crystal Growth and Design

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