| Project/Area Number |
12450269
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | OKAYAMA UNIVERSITY |
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Principal Investigator |
YOSHIO Tetsuo Okayam University, Environmental Science and Technology, Professor, 環境理工学部, 教授 (70032943)
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| Co-Investigator(Kenkyū-buntansha) |
FUJII Tatsuo Okayama University, The Graduate School of Natural Science and Technology, Associate Professor, 大学院・自然科学研究科, 助教授 (10222259)
TAKADA Jun Okayama University, The Graduate School of Natural Science and Technology, Professor, 大学院・自然科学研究科, 教授 (60093259)
NAGAE Masahiro Okayama University, The Graduate School of Natural Science and Technology, Research Associate, 大学院・自然科学研究科, 助手 (60304341)
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| Project Period (FY) |
2000 – 2002
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| Project Status |
Completed (Fiscal Year 2002)
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| Budget Amount *help |
¥14,900,000 (Direct Cost: ¥14,900,000)
Fiscal Year 2002: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2001: ¥5,200,000 (Direct Cost: ¥5,200,000)
Fiscal Year 2000: ¥7,400,000 (Direct Cost: ¥7,400,000)
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| Keywords | electromagnetic wave obstacle / glass ceramic method / Y-type Ba-ferrite / electromagnetic wave absorber / solid solution |
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| Research Abstract |
In the present study, we tried the synthesis of Y-type Ba-hexaferrite expected as an electromagnetic wave absorber by the glass ceramic method. The results are summarized as follows.
The glasses with composition of 0.1MO[xB_2O_3・yBaO・(1-x-y)Fe_2O_3] were prepared and the precipitation process of Y-type Ba-hexaferrite from the glass matrix was investigated. Y-type Ba-hexaferrite particles were precipitated by heating the glass at temperatures between 820℃ and 1100℃. Based on these results, hexagonal platelets of Y-type Ba-hexaferrite with fairly uniform dimension were obtained as precipitates from the glass matrix by leaching with a dilute HCl solution. The low-temperature formation of Y-type Ba-hexafcrrite was due to a reaction between M-type Ba-ferrite and liquid phase. Substitutional solid solutions of Y-type Ba-hexaferrite (Ba_2Zn_<2-x>Co_xFe_<12>O_<22>) were obtained in all composition range. These Y-type Ba-hexaferrite solid solutions showed electromagnetic absorption spectra at frequency range of 8 to 9 GHz.
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