Studies on structural and thermal expansion behavior of alkali-thorium phosphates
作者:K. Krishnan、S.K. Sali、K.D. Singh Mudher
DOI:10.1016/j.jallcom.2005.07.043
日期:2006.4
RbTh 2 (PO4 ) 3 and CsTh 2 (PO4 ) 3, were derived by Rietveld profile analysis of the powder X-ray diffraction data of polycrystalline materials in a monoclinic cell in the space group C 2/ c . The atomic positions of isostructural KTh 2 (PO4 ) 3 were used as the basis of the refinement of atomic parameters of RbTh 2 (PO4 ) 3 and CsTh 2 (PO4 ) 3 . The structure is made of framework of [Th 2 (PO
摘要 RbTh 2 (PO 4 ) 3 和CsTh 2 (PO 4 ) 3 的结构是通过对空间群C 2/ c 中单斜晶胞中多晶材料的粉末X射线衍射数据进行Rietveld剖面分析得出的。同构KTh 2 (PO 4 ) 3 的原子位置被用作细化RbTh 2 (PO 4 ) 3 和CsTh 2 (PO 4 ) 3 原子参数的基础。该结构由[Th 2 (PO 4 ) 3 ] ∞ 骨架构成,边角共用PO 4 四面体和ThO 9 多面体。Rb 和 Cs 原子位于沿 c 轴延伸的大隧道中的双轴上。使用高温粉末 X 射线衍射方法研究了 MTh 2 (PO 4 ) 3 (M = Na、K、Rb 或 Cs) 在室温和 1273 K 之间的热膨胀行为。四种化合物的晶格参数被拟合成关于温度的多项式表达式。四种化合物的平均热膨胀系数来自高温数据。
The synthesis and characterization of crystalline phosphates of thorium, uranium and neptunium
Quarton, Michel; Zouiri, Mustapha; Freundlich, William, Comptes rendus de l'Academie des sciences. Serie II, Mecanique, physique, chimie, sciences de l'univers, sciences de la terre, 1984, vol. 299, p. 785 - 788
作者:Quarton, Michel、Zouiri, Mustapha、Freundlich, William