{"title":"Two new lines of langasite family compositions","authors":"B. Mill","doi":"10.1109/FREQ.2001.956199","DOIUrl":null,"url":null,"abstract":"Isomorphism of ions in Ca/sub 3/Ga/sub 2/Ge/sub 4/O/sub 14/-type structure is considered and criteria of search for new compositions in four-component oxide systems are formulated. The preparation of two new groups of disordered four-component compositions is reported. Ln/sub 3/Ga/sub 3/Ge/sub 2/BeO/sub 14/, possessing wide range of homogeneity, exist with Ln = La-Eu. Substitution for Be/sup 2+/ in 2d tetrahedral site shifts Ln:Ga ratio from garnet one 3:5 to 1:1 and decreases garnet structure stability. This enables to introduce smaller, then Nd/sup 3+/, rare earth ions Sm/sup 3+/ and Eu/sup 3+/. Four-component solid solutions are found in binary section A/sub 3/B/sub x/M/sub 2/Si/sub 4-x/O/sub 14/ of silicate systems AO-BO/sub 2/-M/sub 2/O/sub 3/-SiO/sub 2/ (A=Ca, Sr, Ba; B=Ge, Ti, Sn, Zr; M=Ga, Fe). Some Ti-Ga-silicate compositions look promising for melt crystal growth. Principles of crystallization in four-component system are discussed.","PeriodicalId":369101,"journal":{"name":"Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2001-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the 2001 IEEE International Frequncy Control Symposium and PDA Exhibition (Cat. No.01CH37218)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/FREQ.2001.956199","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
Isomorphism of ions in Ca/sub 3/Ga/sub 2/Ge/sub 4/O/sub 14/-type structure is considered and criteria of search for new compositions in four-component oxide systems are formulated. The preparation of two new groups of disordered four-component compositions is reported. Ln/sub 3/Ga/sub 3/Ge/sub 2/BeO/sub 14/, possessing wide range of homogeneity, exist with Ln = La-Eu. Substitution for Be/sup 2+/ in 2d tetrahedral site shifts Ln:Ga ratio from garnet one 3:5 to 1:1 and decreases garnet structure stability. This enables to introduce smaller, then Nd/sup 3+/, rare earth ions Sm/sup 3+/ and Eu/sup 3+/. Four-component solid solutions are found in binary section A/sub 3/B/sub x/M/sub 2/Si/sub 4-x/O/sub 14/ of silicate systems AO-BO/sub 2/-M/sub 2/O/sub 3/-SiO/sub 2/ (A=Ca, Sr, Ba; B=Ge, Ti, Sn, Zr; M=Ga, Fe). Some Ti-Ga-silicate compositions look promising for melt crystal growth. Principles of crystallization in four-component system are discussed.
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