Teneur en oxygéne et formule exacte d'une famille de composés habituellement appelés “variété β” ou “phase complexe” des sulfures de terres rares

Teneur en oxygéne et formule exacte d'une famille de composés habituellement appelés “variété β” ou “phase complexe” des sulfures de terres rares
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稀有硫磺的“变体β”或“相复合物”的氧气特性和配方

DOI:
10.1016/0022-4596(73)90159-x
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发表时间:
1973
影响因子:
3.3
通讯作者:
P. Besançon
P. Besançon
中科院分区:
化学3区
文献类型:
--
作者:
P. Besançon

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β型稀土硫化物为固溶体,其化学式为L10 S14 OxS 1− x(L= La. Sm,0 <$x <$1)。晶胞为四元胞(14 1 acd),包含8个分子式.氧和硫在同一位置上互相取代。L10 S14 O氧硫化物与La ~ Sm的所有稀土元素共存.它们是该家族中在高温下最稳定的化合物。也存在La、Ce、Pr的L 10 Se 14 O氧硒化物和固溶体La 10 Se 14 O x Se 1− x。均匀性范围的程度从La到Sm减小。从活化分析测定氧的结果看,真正的β型La 2S 3硫化物似乎只与La共存。La 2S 3有三种多晶型:α(正交晶系)、β(四方晶系)、γ(立方晶系).其他稀土(Ce至Tb)硫化物仅显示两种:α和γ。
The β variety of rare earth sulfides shows solid solution, the formula of which is L 10 S 14 O x S 1− x (L= La… Sm, 0⩽ x⩽ 1). The unit cell is tetragonal (14 1 acd) and contains 8 formulas. Oxygen and sulphur substitute for one another on the same site. The L 10 S 14 O oxysulfides exist with all rare earths from La to Sm. They are the most stable compounds of this family at high temperature. L 10 Se 14 O oxyselenides of La, Ce, Pr, and the solid solution La 10 Se 14 O x Se 1− x, also exist. The extent of the homogeneity range decreases from La to Sm. From determination of oxygen by activation analysis, true La 2 S 3 sulfide of β form seems to exist only with lanthanum. Lanthanum sulfide La 2 S 3 shows three polymorphic forms: α (orthorhombic), β (tetragonal), γ (cubic). The other rare earth (Ce to Tb) sulfides show only two: α and γ.