アルカリ土類金属バナジン酸塩ガラスの構造研究(第2報) : ^<51>V NMR分光法による研究

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The structure of alkalille earth vanadate glasses, _xMO・ (100-x)V_20_5 (M=Ca, Sr, Ba, x=30, 40, 45, 50, 55) , has been investigated by means of <51>^V static and magic angle spinning (MAS) NMR spectroscopies. The <51>^V NMR spectral parameters of various constituent vanadate groups contained in the vanadate glasses were determined by the spectrum simulation with reference to those of various crystalline vanadates ob tained previously. It was found that the structure of alkaline earth vanadate glasses consists mainly of VO_4 tetrahedra in accordance with the authors' previous results based on the IR study. It was deduced that for x=50 the glass network is mainly constituted of one dimensional (VO_3)_n single chains, and for x≦45 the decrease of the MO content yields a mixture of the V_2O_5 rich phase constituted of three dimensionally branched V0_4 groups and the MO rich phase constitut ed of the VO_5 trigonal bipyramids, followed by the decrease of (V0_3)_n single chains.
1994-06-01