Thermal decomposition of lanthanide and actinide tetrafluorides
作者:John K. Gibson、Richard G. Haire
DOI:10.1016/0040-6031(88)87164-8
日期:1988.10
The thermalstabilities of several lanthanide/actinide tetrafluorides have been studied using mass spectrometry to monitor the gaseous decomposition products, and powder X-ray diffraction (XRD) to identify solid products. The tetrafluorides, TbF/sub 4/, CmF/sub 4/, and AmF/sub 4/, have been found to thermally decompose to their respective solid trifluorides with accompanying release of fluorine, while
Thermal decomposition of curium tetrafluoride and terbium tetrafluoride
作者:John K. Gibson、Richard G. Haire
DOI:10.1016/0022-4596(88)90140-5
日期:1988.4
The thermaldecompositions of both curium and terbium tetrafluorides have been studied using mass spectrometry to monitor the effusate from a Knudsen cell containing the condensed fluoride. Curium tetrafluoride was found to decompose at 330–430°C in vacuum. A Second Law enthalpy of 26.3 ± 2 kcal/mole (at 370°C) is derived from van't Hoff plots of results obtained for the decomposition reaction: CmF4(s)→CmF3(s)
Synthesis and crystal structures of new mixed-valence terbium (III/IV) fluorides with a random distribution between Tb3+ and Tb4+
作者:M. Josse、M. Dubois、M. El-Ghozzi、D. Avignant
DOI:10.1016/j.jallcom.2003.11.140
日期:2004.7
Abstract The thermal decomposition of terbium tetrafluoride was already used for the synthesis of mixed-valence terbium fluorides such as KTb 3 F 12 or K 2 Tb 4 F 17 . In this paper, new mixed-valence terbium (III/IV) fluorides with formula Rb 2 AlTb 3 F 16 and RbAl 2 Tb 4 F 22 with a statistical distribution between Tb(III) and Tb(IV) are presented. The Rb 2 AlTb 3 F 16 compound which crystallizes
摘要 四氟化铽的热分解已被用于合成KTb 3 F 12 或K 2 Tb 4 F 17 等混合价氟化铽。在本文中,提出了具有分子式 Rb 2 AlTb 3 F 16 和 RbAl 2 Tb 4 F 22 的新型混合价铽 (III/IV) 氟化物,其统计分布在 Tb(III) 和 Tb(IV) 之间。在六方晶系中结晶的 Rb 2 AlTb 3 F 16 化合物,空间群 P 6 3 / mmc (n° 194),晶胞参数 a =7.556(6) A 和 c =12.397(3) A 表现出不寻常的结构单元 [Tb 3 F 22 ] 11− 由三个单帽方形反棱镜 TbF 9 通过共享一个公共角的边缘产生。RbAl 2 Tb 4 F 22 化合物在四方晶系中结晶,空间群 I 4/ mmm (n° 139),晶胞参数 a =10.662(2) A 和 c =6.911(3) A。该结构由共享边缘的 TbF
Magnetic behaviour of the MTbF6 fluoroterbates (M=Cd, Ca, Sr, (α/β)-Ba)
(β-Ba)), except for the α form of BaTbF6. The crystal structure of this latter fluoroterbate has also been investigated by means of high-resolution neutron powder diffraction. From Neutron Powder Diffraction data, CdTbF6 and β-BaTbF6 magnetic structures were determined, together with the metamagnetic behaviour of β-BaTbF6 as a function of an external magnetic field. A tentative phase diagram is then given
Reactions between XeF2 or alkali metal tetrafluorohalogenates(III) and Rare Earth elements oxides, ZrO2, and HfO2 have been studied. The formation conditions of the binary and complex fluorides have been investigated. The comparison of the fluorination activity of Xe(II), Cl(III), and Br(III) fluorides has been proposed.