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Liquid phase low temperature sintering of niobate and cerate fine powders |
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| Authors: | O. A. Shlyakhtin A. V. Orlov Young-Jei Oh |
| Affiliation: | (1) Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, 136-791 Seoul, Korea;(2) Institute of Chemical Physics, Russian Academy of Sciences, Kosygina st. 4, 119991, Moscow, Russia;(3) Department of Materials Science, Moscow State University, 119992 Moscow, Russia;(4) Institute of Chemistry, Technical University Berlin, 10623 Berlin, Germany;(5) Materials Science and Technology Division, Korea Institute of Science and Technology, 39-1 Hawolgok-dong, Seongbuk-gu, 136-791 Seoul, Korea |
| Abstract: | The efficiency of simultaneous application of chemically-derived starting powders and melt-forming sintering aids in low temperature sintering has been demonstrated. Doping of cryochemically processed BiNbO4 powders with CuO/V2O5 causes reducing sintering temperatures from 850–900∘C to 700–720∘C. Similar doping of Zn3Nb2O8 fine powders allows to obtain ceramics with density 97–98% and Q × F values up to 40 000 GHz at T > 720∘C. The sintering of solution-derived BaCeO3 powders doped with CuO results in dense ceramics at T = 1000∘C. Morphological evolution during sintering was observed using hot stage SEM. Low temperature liquid phase sintering of fine powders is rather sensitive to the traces of secondary phases and to the micromorphology of starting powders though observed reduction of sintering temperatures is substantially larger than for traditional liquid phase sintering of coarse-grained oxide powders. |
| Keywords: | Low temperature sintering Fine powders Freeze drying Microwave dielectrics Barrier materials |
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