Hydrothermal Synthesis, Crystal Structure, and Magnetic Properties of FeVO4-II
1996; Elsevier BV; Volume: 123; Issue: 1 Linguagem: Inglês
10.1006/jssc.1996.0151
ISSN1095-726X
AutoresYoshio Oka, Takeshi Yao, Naoichi Yamamoto, Yutaka Ueda, Shuji Kawasaki, Masaki Azuma, Mikio Takano,
Tópico(s)Luminescence Properties of Advanced Materials
ResumoFeVO4-II, a metastable phase so far produced under high pressures, has been synthesized by a hydrothermal method from a solution of VOCl2and FeCl3. FeVO4-II crystallizes in the orthorhombic system:Cmcm,a= 5.6284(7) Å,b= 8.2724(7) Å,c= 6.1118(6) Å, withZ= 4. The single-crystal structure refinements verified a CrVO4-type structure and converged to R/Rw= 0.035/0.029 for 324 reflections withI> 3σ(I). The structure consists of FeO6octahedra and VO4tetrahedra where edge-sharing FeO6octahedra form isolated FeO4chains running parallel to thecaxis and the chains are joined by VO4tetrahedra. The temperature dependence of magnetic susceptibility featured by a broad maximum around 52 K suggests the predominance of one-dimensional antiferromagnetic interactions in the FeO4chains. A three-dimensional antiferromagnetic order is attained somewhere below 40 K yielding a hyperfine field of 483 KOe at 4.2 K observed in the Mössbauer spectrum.
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