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Crystal Growth of Rare‐Earth Orthoarsenates
Author(s) -
FEIGELSON ROBERT S.
Publication year - 1967
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1967.tb15150.x
Subject(s) - rare earth , crystal growth , materials science , earth (classical element) , astrobiology , mineralogy , crystal (programming language) , geology , crystallography , chemistry , physics , computer science , programming language , mathematical physics
Single crystals of rare‐earth arsenate compounds (of the type RAsO 4 ) were synthesized and grown by the flux technique, using lead pyroarsenate as the solvent. Rare‐earth oxides in concentrations of 2 mole % were dissolved in molten lead pyroarsenate (Pb 2 As 2 O 7 ) at 1300°C. After 6 hr at temperature the solution was cooled at a rate of 4°C/hr or less for recrystallization of RAsO 4 . Nucleation and growth occur from 1300° to 925°C. Details for preparation of Pb 2 As 2 O 7 are given. Experiments on the growth of mixed rare‐earth orthoarsenates and mixed phosphate‐arsenate compositions are discussed together with the anomalous behavior of cerium and neodymium arsenates.