Crystal structure and magnetic characterization of (NH4)2FeF5·H2O
1988; Elsevier BV; Volume: 74; Issue: 1 Linguagem: Inglês
10.1016/0022-4596(88)90328-3
ISSN1095-726X
AutoresJ.L. Fourquet, F. Plet, Y. Calagé,
Tópico(s)Crystal Structures and Properties
ResumoThe compound (NH4)2FeF5·H2O is prepared by hydrothermal synthesis in HF solutions. The material is orthorhombic, space groupPbcn,a = 10.491(4)A˚,b = 8.090(3)A˚,c = 7.997(3)A˚,Z = 4. The crystal structure—isotypic with that of (NH4)2AlF5·H2O—is determined from single-crystal diffraction intensity data and refined to the conventional values of the indexesR = 0.0272 andRw = 0.0262. The structure is characterized by isolated [FeF5(H2O)]2− octahedra linked together by OH … F strong hydrogen bonds and forming zigzag chains running along 001. NH+4 ions connect these chains by NH … F hydrogen bonds. As expected, the compound exhibits a paramagnetic behavior in the range 80–300 K and is not magnetically ordered at 4.2 K as shown by Mo¨ssbauer spectroscopy.
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