Characterization and sintering of MoO{sub 3} prepared by thermal decomposition of hexaammonium heptamolybdate tetrahydrate
Journal Article
·
· Materials Research Bulletin
- Doshisha Univ., Tanabe, Kyoto (Japan)
- Taiyo Koko Co., Ltd., Hogo, Ako (Japan)
MoO{sub 3} powders with plate particles have been prepared by heating hexaammonium heptamolybdate tetrahydrate ((NH{sub 4}){sub 6}Mo{sub 7}O{sub 24} {center_dot} 4H{sub 2}O) for 1 h at 650 C. Densification has been performed by hot pressing for 2 h at 630 C and 30 MPa. Grain-oriented MoO{sub 3} ceramics (>98% of theoretical) are fabricated, in which the <010> axis is parallel to the hot pressing direction. Their electrical conductivities have been measured in the temperature range of 100 to 600 C. Sintered MoO{sub 3} is a ceramic semiconductor. Activation energies are determined to be 0.49 and 0.76 eV for initial and final stages, respectively.
- OSTI ID:
- 455219
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 1 Vol. 32; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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