白钨矿
稀土
还原(数学)
氢
金属
土(古典元素)
化学
无机化学
材料科学
冶金
矿物学
钨
数学
几何学
数学物理
有机化学
作者
Jagannatha Gopalakrishnan,Arumugam Manthiram
出处
期刊:Journal of The Chemical Society-dalton Transactions
日期:1981-01-01
卷期号: (3): 668-668
被引量:15
摘要
Scheelite-related α-Ln2Mo3O12(Ln = La, Pr, Nd, Sm, Gd, Tb, or Dy) oxides are reduced by hydrogen at 780–870 K yielding molybdenum (IV) oxides of formula Ln2Mo3O9. The latter crystallize in a tetragonal scheelite (ABO4) type structure where one third of the A sites and a quarter of the anion sites are vacant: Ln2/3(□cat)1/3MoO3(□an). The reaction Ln2Mo3O12+ 3H2→ Ln2Mo3O9(□an)3+ 3H2O may be regarded as topochemically controlled, since both the parent and the product phases have scheelite-related structures. Infrared spectra and electrical and magnetic properties of these metastable defect scheelite phases are reported.
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