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Title: Preparation of yttrium, lanthanum, cerium, and neodymium basic carbonate particles by homogeneous precipitation

Uniform yttrium, lanthanum, cerium, and neodymium basic carbonate particles were prepared by homogeneous precipitation. Powders were characterized with respect to size, shape, crystal structure, and thermal decomposition behavior. Yttria precursor particles were spherical, monosized (0.4 {mu}m), and amorphous; whereas lanthana, neodymia, and ceria precursors were prismatic (ranging from 1 to 6 {mu}m in size) and crystalline. Crystal structure was found to be ancylite-type orthorhombic symmetry in all three cases. Upon heating in air, yttrium, lanthanum, and neodymium precursors underwent two-step decomposition to first form oxycarbonate and then oxide. Cerium hydroxycarbonate decomposed in a single step to form the oxide.
Authors:
;  [1]
  1. (Iowa State Univ., Ames (USA))
Publication Date:
OSTI Identifier:
6109241
Resource Type:
Journal Article
Resource Relation:
Journal Name: Advanced Ceramic Materials; (USA); Journal Volume: 2:3A
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CERIUM CARBONATES; CHEMICAL PREPARATION; CRYSTAL STRUCTURE; LANTHANUM CARBONATES; NEODYMIUM CARBONATES; YTTRIUM CARBONATES; COLLOIDS; EXPERIMENTAL DATA; MEASURING METHODS; ORTHORHOMBIC LATTICES; OXIDES; CARBON COMPOUNDS; CARBONATES; CERIUM COMPOUNDS; CHALCOGENIDES; CRYSTAL LATTICES; DATA; DISPERSIONS; INFORMATION; LANTHANUM COMPOUNDS; NEODYMIUM COMPOUNDS; NUMERICAL DATA; OXYGEN COMPOUNDS; RARE EARTH COMPOUNDS; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS 360201* -- Ceramics, Cermets, & Refractories-- Preparation & Fabrication; 360202 -- Ceramics, Cermets, & Refractories-- Structure & Phase Studies