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Title Transcription
メリライト ニオケル ヨウイオン ブンプ ト ケッショウ コウゾウ ニ カンスル ショモンダイ
Title Alternative (English)
The subjects on melilite: the relathionship between ionic distribution and crystal structure.
File
language
jpn
Author
Hamada, Maki
Akasaka, Masahide
Description
The melilite group is one of the feldspathoid minerals and important rock-forming minerals. Crystal structure of melilite group (tetragonal system with the space group P4^^^-2_1m) consists of 8-coordinated W site, and structurally independent two tetrahedral T1 and T2 sites. Main end-members of melilite are akermanite (Ca_2MgSi_2O_7), ferro-akermanite (Ca_2Fe^<2+>Si_2O_7), gehlenite (Ca_2Al^<3+>_2SiO_7), soda melilite (NaCaAlSi_2O_7), ferri-gehlenite (Ca_2Fe^<3+>_2SiO_7), ferri-aluminum gehlenite (Ca_2Fe^<3+>Al^<3+>SiO_7), hardystonite (Ca_2ZnSi_2O_7), gugianite (Ca_2BeSi_2O_7), and okayamalite (Ca_2BSi_2O_7) components. Moreover, Sr and Ba substitute for Ca, and, thus, chemical compositions of melilite group vary in a wide range. Essential subjects for the melilite group are 1) cation distributions in the T1 and T2 sites and their controlling factors, and 2) the effect of ionic substitutions at the W, T1 and T2 sites on the crystal structure, especially on the incommensurate structure. These subjects have been studied systematically using X-ray diffraction, electron diffraction and Mossbauer spectroscopic methods. In this paper, the authors review the studies on 1) the controlling factor for distribution of cation in the T1 and T2 sites, and 2) the relationship between ionic distributions and incommensurate structure.
Subject
melilite group
incommensurate structure
ionic substitution
crystal chemistry
Journal Title
島根大学地球資源環境学研究報告
Volume
34
Start Page
9
End Page
14
ISSN
13439774
Published Date
2016-03-05
NCID
AA11455176
DOI(SelfDOI)
Publisher
島根大学大学院総合理工学研究科地球資源環境学教室
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
Gyoseki ID
e28951
OAI-PMH Set
Interdisciplinary Graduate School of Science and Engineering
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