2024-03-29T05:55:57Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/367862022-11-17T02:08:08Zhdl_2115_35169hdl_2115_34816hdl_2115_116An Experimental Study of SiO2 Solubility in HausmanniteKikuchi, TakeshiSato, Hiroaki1000070157436Miura, Hiroyukiopen access450Solid solubility of SiO2 component in hausmannite has been experimentally determined. The solid solubility of hausmannite coexisting with rhodonite in air at 1200℃ determined by microprobe analyses is the atomic ratio Si/(Mn+Si) of 0.015(2). Reaction between hausmannite and quartz at 900℃ under hematite-magnetite buffer was not attained in equilibrium. Metastable Mn3O4-SiO2 solid solutions have been synthesized in air at 60℃ by a coprecipitation method. The atomic ratio Si/(Mn+Si) is achieved to about 0.025 by this way. It is indicated that the increase of Si content in hausmannite decreases the lattice parameter c and increases a slightly. Concentrations of constituent ions and cation vacancy in hausmannite have been calculated as a function of Po2 and temperature by using a defect chemical equilibrium relations. Possibility to finding the natural hausmannite which is supersaturated with SiO2 is suggested.北海道大学Hokkaido University1994-03engdepartmental bulletin paperVoRhttp://hdl.handle.net/2115/367860018-3474北海道大学理学部紀要Journal of the Faculty of Science, Hokkaido University. Series 4, Geology and mineralogy233321328https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/36786/1/23-3_p321-328.pdfapplication/pdf2.69 MB1994-03