JaLCDOI 10.18926/ESR/49209
Title Alternative The temperature and pressure conditions of synthetic Sibirskite and Parasibirskite
FullText URL esr_019_1_013_017.pdf
Author Kano, Masahiro| Yamakawa, Junji|
Abstract Sibirskite (CaHBO ) and parasibirskite ₃ are in the relation of polymorphism, these are regarded as the alteration products of takedaite (Ca₃B₂O₆), occurs at Fuka mine, Okayama Prefecture. The synthesis of parasibirskite was reported by the Schäfer (1968a, b) etc. and the synthesis of sibirskite was reported by the Sun et al. (2011). To determine the formation condition of sibirskite and parasibirskite in the natural, they were synthesized from the natural takedaite (Ca₃B₂O₆). As a result, both of sibirskite and parasibirskite were formed by the duration time of 7 days with 1000 kg/cm2 and 300 oC, on the other hand, only sibirskite was formed by the duration time of 14 days with the same condition. In addition, the mixtures of sibirskite and parasibirskite were examined under the various temperatures and pressures of hydrothermal conditions. As a result, the upper limit of the stable temperature and pressure conditions of sibirskite was estimated between 350 oC and 400 oC at 1500 kg/cm2, and between 400 oC and 450 oC at 500 kg/cm2 . In the higher temperature than the condition, sibirskite were changed into shimazakiite (Ca₂B₂O₅).
Keywords Sibirskite Parasibirskite Shimazakiite Fuka Hydrothermal synthesis
Publication Title Okayama University Earth Science Report
Published Date 2012-12-26
Volume volume19
Issue issue1
Start Page 13
End Page 17
ISSN 1340-7414
language 日本語
Copyright Holders © 2012 by Okayama University Earth Science Reports Editorial Committee All Rights Reserved
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NAID 120005232327