Add time:07/17/2019 Source:sciencedirect.com
Using a high-temperature ampoule technique, a series of mixed nickel-iron-gallium metal-rich tellurides with layered structures, Ni3-xFexGaTe2, were prepared and characterized based on X-ray powder diffraction, energy-dispersive spectroscopy, and 57Fe Mössbauer spectroscopy data. These compounds may be regarded as a result of partial substitution of nickel by iron in the recently reported ternary Ni3-xGaTe2 series, which are based on NiAs/Ni2In type of structure. The compositional boundary for the substitution was found to be at x~1. According to the Mössbauer spectroscopy data, the substitution is not statistical, and iron atoms with the increase in x tend to preferentially occupy those nickel positions that are partially vacant in the initial ternary compound. Magnetic measurements data for the Ni3-xFexGaTe2 series show dramatic change in behavior from temperature-independent paramagnetic properties of the initial matrix to a low-temperature (~75 K) ferromagnetic ordering in the Ni2FeGaTe2.
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