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Subsolidus Phase Equilibria of the CaO‐B 2 O 3 ‐BaO System
Author(s) -
Ji Yangyang,
Liang Jingkui,
Xie Sishen,
Yu Yude
Publication year - 1995
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.1151-2916.1995.tb08244.x
Subject(s) - monoclinic crystal system , isostructural , lattice constant , chemistry , ternary operation , crystallography , powder diffraction , ternary numeral system , crystal structure , phase (matter) , solid solution , mineralogy , x ray crystallography , analytical chemistry (journal) , diffraction , physics , programming language , organic chemistry , computer science , optics , chromatography
The “subsolidus” phase relations at room temperature in the system CaO‐B 2 O 3 ‐BaO are investigated. Specimens of various compositions were prepared from appropriate ratios of CaCO 3 , B 2 O 3 , and BaCO 3 , and fired from 780° to 1040°C according to their melting points. There are three ternary compounds in this system. The crystal structures of these compounds were determined by X‐ray diffraction (XRD). CaBa 2 (BO 3 ) 2 and Ca 5 Ba 2 B 10 O 22 are monoclinic structures. The lattice constants a = 14.221 Å, b = 4.569 Å, c = 11.926 A, β= 99.947°, and V = 763.4 å 3 for CaBa 2 (BO 3 ) 2 and a = 15.714 å, b = 6.184 å, c = 10.204 å, β= 93.954°, and V = 989.29 å 3 for Ca 5 Ba 2 B 10 O 22 are obtained. The third compound, CaBa 2 (B 3 O 6 ) 2 , is isostructural with the high form of BaB 2 O 4 with lattice constants a = 7.167 å and c = 35.298 å. Powder second harmonic generation efficiencies of these ternary compounds were measured using a homemade apparatus.