INVESTIGATIONS OF CRYSTAL-CHEMICAL VARIABILITY IN LEAD URANYL OXIDE HYDRATES. I. CURITE
نویسندگان
چکیده
منابع مشابه
Investigations of Crystal-chemical Variability in Lead Uranyl Oxide Hydrates. I. Curite
Structures have been refined for 14 single crystals of curite from various localities in the Democratic Republic of Congo, and for one synthetic crystal grown at 220°C using hydrothermal techniques. Single-crystal diffraction data were collected using MoKa X-radiation and a CCD-based detector mounted on a Bruker three-circle diffractometer. The crystals have orthorhombic symmetry, space group P...
متن کاملInvestigations of Crystal-chemical Variability in Lead Uranyl Oxide Hydrates. Ii. Fourmarierite
Structures have been refined for twelve crystals of fourmarierite from various localities in the Democratic Republic of Congo, and one synthetic crystal. Single-crystal diffraction data were collected using MoKa X-radiation and a CCD-based detector mounted on a Bruker three-circle diffractometer. All crystals have orthorhombic symmetry, space group Bb21m. The natural crystals have similar unit-...
متن کاملCalculating the local solvent chemical potential in crystal hydrates.
Determining solvation patterns in biological systems is crucial in investigating the functional role water may play in structural stabilization and molecular recognition. Determining whether a particular position would be occupied by a solvent molecule requires the local thermodynamics to be known. In this work we introduce a simple and inexpensive approach based on grand canonical molecular si...
متن کاملAb initio study of the uranyl oxide hydrates: a proton transfer mediated by water.
We present a first-principles study of the UO(3)·n(H(2)O) uranyl oxide hydrates, namely, schoepite (n = 2.25), metaschoepite (n = 2) and dehydrated metaschoepite (n = 1.75), which appear as the alteration U(VI) products of aqueous corrosion of nuclear fuel. For these compounds, the calculated enthalpy of formation is in good agreement with calorimetry and solubility measurements. We discuss the...
متن کاملSYNTHESIS AND CRYSTAL STRUCTURE OF A NEW Pb URANYL OXIDE HYDRATE WITH A FRAMEWORK STRUCTURE THAT CONTAINS CHANNELS
Using lead oxide, uranyl nitrate and ultrapure water, seven hydrothermal synthesis experiments were performed with Pb:U molar ratios ranging from 1:1 to 1:10. Reaction products were characterized by powder and single-crystal X-ray diffraction. Two novel Pb uranyl oxide hydrates were found, with structural formulae Pb2(H2O)[(UO2)10UO12(OH)6(H2O)2] and Pb0.5[(UO2)4O2(OH)5](H2O)4 (Pb-poor fourmari...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Canadian Mineralogist
سال: 2000
ISSN: 0008-4476,1499-1261
DOI: 10.2113/gscanmin.38.3.727