Published October 30, 1984 | Version v1
Journal article Metadata-only

Crystal chemistry of lead thorium orthophosphates

Creators

  • 1. Universite Pierre et Marie Curie, 75 - Paris (France)
  • 2. Laboratoire de Chimie Minerale, E.R. 09-CNRS, 54 - Tours (France)

Description

Three double orthophosphates, with congruent melting, have been revealed by D.T.A. and X-ray diffraction for the molar ratios Pb3(PO4)2/Th3(PO4)4: 1/2, 1/1 and 7/1. Pb3Th6(PO4)10, isostructural with Msup(I)Th2(PO4)3 monoclinic orthophosphates, contains vacancies for Pb and Th cationic networks according to Pbsub(0.9)(vacancy)sub(0.1) Thsub(1.8)(vacancy)sub(0.2) (PO4)3. PbTh(PO4)2 is isotypic with monazite (Ce, La)PO4. Pb7Th(PO4)6 has an eulytite, Bi4(SiO4)3, type structure. The crystallographic data and the substitutional mechanisms of these compounds are precised

Abstract (French)

Trois orthophosphates doubles a fusion congruente sont mis en evidence par A.T.D. et diffraction X pour les rapports molaires Pb3(PO4)2/Th3(PO4)4=1/2, 1/1 et 7/1. Pb3Th6(PO4)10, isotype des orthophosphates monocliniques Msup(I)Th2(PO4)3, presente deux sous-reseaux cationiques lacunaires selon Pbsub(0.9)(lacune)sub(0.1) Thsub(1.8)(lacune)sub(0.2) (PO4)3. PbTh(PO4)2 est isostructural de la monazite (Ce, La)PO4. Pb7Th(PO4)6 est isotype de l'eulytine Bi4(SiO4)3. Les caracteristiques cristallographiques et les schemas substitutionnels de ces composes sont precises

Additional details

Additional titles

Original title (French)
Cristallochimie des orthophosphates doubles de thorium et de plomb

Publishing Information

Journal Title
C. R. Seances Acad. Sci., Ser. 2
Journal Volume
299
Journal Issue
12
Series
C. R. Seances Acad. Sci., Ser. 2.
Journal Page Range
785-788
ISSN
0249-6305

INIS

Country of Publication
France
Country of Input or Organization
France
INIS RN
16030136
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
CHEMICAL PREPARATION; CRYSTALLOGRAPHY; CUBIC LATTICES; DENSITY; LEAD PHOSPHATES; MONOCLINIC LATTICES; PHASE DIAGRAMS; PHASE STUDIES; THORIUM PHOSPHATES; VACANCIES
Descriptors DEC
ACTINIDE COMPOUNDS; CRYSTAL DEFECTS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIAGRAMS; INFORMATION; LEAD COMPOUNDS; OXYGEN COMPOUNDS; PHOSPHATES; PHOSPHORUS COMPOUNDS; PHYSICAL PROPERTIES; POINT DEFECTS; SYNTHESIS; THORIUM COMPOUNDS