1990 Fiscal Year Final Research Report Summary
Preparation and Characterization of Ceramic Oxides by Wet Method (Basic Research)
| Project/Area Number |
01470073
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学
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| Research Institution | Kyoto University |
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Principal Investigator |
YAMAMOTO Naoichi Kyoto Univ., Dep. of Liberal Arts and Sci., Professor, 教養部, 教授 (70027704)
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| Co-Investigator(Kenkyū-buntansha) |
TAMADA Osamu Kyoto Univ., Dep. of Liberal Arts and Sci., Associate Professor, 教養部, 助教授 (40026828)
OKA Yoshio Kyoto Univ., Dep. of Liberal Arts and Sci., Associate Professor, 教養部, 助教授 (10152282)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Hollandite / Single crystal / Vanadium dioxide / Layer structure / Lietvelt method / Sillenite |
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| Research Abstract |
1. Mn-O-OH system ; by using test-tube type autoclave, more extensive study was carried out. The single crystal of hollandite type MnO_2 was newly synthesized and chemical composition was given as Rb_<1.5> Mn_8 O_6. Crystal structure analysis showed that Rb ion of the material lies in a tunnel of the crystal structure of 2x2 size.
2. V-O-OH system ; by using Moley type autoclave, formation diagram of V-O-OH system was studied. A lot of metastable previously-unknown compounds were found and some of them were isolated to carry out to determine the crystal structures by using Riettvelt Xーray analytical method. Moreover, new comer of hydrated layer-structured vanadium oxides and their derivatives which contained alkaline metal ions were synthesized. Transformation properties between hydrated layer-structured vanadium oxides, which have the same mother lattice of vanadium-oxygen Pyramid structure, but were in different amount of hydrosis, were studied.
3. Bi-Fe-O-OH system ; Fe-sillenite crystal powder was precipitated directly from the aqueous solution containing each element ions of Bi, Fe, OH^-. It was found that particle shape of a crystal could be controlled by reaction conditions, such as reaction temperature, alkaline concentration and so on. Behavior of the sintering process was also studied.
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