Synthesis  Crystal Growth  Structural and Magnetic Characterization of NH4MCl2 HCOO   M

Synthesis Crystal Growth Structural and Magnetic Characterization of NH4MCl2 HCOO M

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  • Publish Date: 2015
  • ISBN-10: OCLC:960795850
  • ebook-synthesis-crystal-growth-structural-and-magnetic-characterization-of-nh4mcl2-hcoo-m.pdf
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Book Summary

In this paper, an ambient-pressure solution route and an improved solvothermal synthetic method have been developed to produce polycrystalline powders and large single crystals of NH4MCl2(HCOO) (M=Fe, Co, Ni). The magnetic structure of the 1D linear chain compound NH4FeCl2(HCOO) has been determined by low-temperature neutron powder diffraction, revealing ferromagnetic intra-chain interactions and antiferromagnetic inter-chain interactions. Finally, the newly-reported Co and Ni analogs are isostructural with NH4FeCl2(HCOO), but there are significant differences in the magnetic properties of each compound; the Ni analog behaves similarly to the Fe compound but with stronger magnetic coupling, exhibiting antiferromagnetic ordering (TN=8.5 K) and a broad metamagnetic transition between 2 and 5 T, while the Co analog does not order magnetically above 2 K, despite strong antiferromagnetic nearest-neighbor interactions.

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