Fabrication, microstructure and electrical conductivity of V{sub 2}O{sub 5} ceramics
- Doshisha Univ., Kyoto (Japan). Dept. of Molecular Science and Technology
- Taiyo Koko Co. Ltd., Hyogo (Japan)
V{sub 2}O{sub 5} gels corresponding to the formula V{sub 2}O{sub 5} {center_dot} nH{sub 2}O with n = 2.07, 0.5, and 0.2 have been prepared by the hydrolysis of VO(OC{sub 2}H{sub 5}){sub 3}, followed by washing and drying. After dehydration, V{sub 2}O{sub 5} crystallizes at 310--400 C. V{sub 2}O{sub 5} powders with strip-like particles are produced after heating at 630 C. Well-densified V{sub 2}O{sub 5} ceramics (97.7% of theoretical) have been fabricated by the combined use of hot pressing (630C/2h/30MPa) and hot isostatic pressing (630 C/1h/196MPa). The texture is of a plate structure, the grain being {approx}30 {micro}m long and {approx}6 {micro}m wide. Electrical conductivities have been measured in the temperature range of 25--600 C. Activation energies are determined to be 0.09 and 0.18 eV for initial and final stages, respectively.
- OSTI ID:
- 242180
- Journal Information:
- Materials Research Bulletin, Vol. 31, Issue 5; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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