ELECTRIC CONDUCTIVITY OF Fe2SiO4–Fe3O4 SPINEL SOLID SOLUTIONS
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dc.contributor.author | Yamanaka T. | |
dc.contributor.author | Shimazu H. | |
dc.contributor.author | Ota K. | |
dc.date.accessioned | 2021-03-17T05:23:34Z | |
dc.date.available | 2021-03-17T05:23:34Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=872443 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2001, 28, 2, 110-118 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/26855 | |
dc.description.abstract | The spinel solid solution was found to exist in the whole range between Fe3O4 and γ-Fe2SiO4 at over 10 GPa. The resistivity of Fe3− x Si x O4 (0.0<x<0.288) was measured in the temperature range of 80∼300 K by the AC impedance method. Electron hopping between Fe3+ and Fe2+ in the octahedral site of iron-rich phases gives a large electric conductivity at room temperature. The activation energy of the electron hopping becomes larger with increasing γ-Fe2SiO4 component. A nonlinear change in electric conductivity is not simply caused by the statistical probability of Fe3+–Fe2+ electron hopping with increasing the total Si content. This is probably because a large number of Si4+ ions occupies the octahedral site and the adjacent Fe2+ keeping the local electric neutrality around Si4+ makes a cluster, which generates a local deformation by Si substitution. The temperature dependence of the conductivity of solid solutions indicates the Verwey transition temperature, which decreases from 124(±2)K at x=0 (Fe3O4) to 102(±5)K at x=0.288, and the electric conductivity gap at the transition temperature decreases with Si4+ substitution. | |
dc.subject | FE3-x SIx O4 SPINEL SOLID SOLUTION | |
dc.subject | SOLID SOLUTION | |
dc.subject | CATION DISTRIBUTION | |
dc.subject | ELECTRIC CONDUCTIVITY | |
dc.subject | VERWEY TRANSITION TEMPERATURE | |
dc.subject | NONSTOICHIOMETRY | |
dc.title | ELECTRIC CONDUCTIVITY OF Fe2SiO4–Fe3O4 SPINEL SOLID SOLUTIONS | |
dc.type | Статья |
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