Low Temperature Sintering of Zn3Nb2O8 Ceramics from Fine Powders

Shlyakhtin, O.A.; Oh, Young−Jei

doi:10.1111/j.1551-2916.2006.01246.x

Cited by 34 publications

(20 citation statements)

References 42 publications

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“…Variation of the thermal processing conditions allows modification of the micromorphology of the particles thus formed, and ensures the maximum sinterability of oxide powders in order to obtain dense functional ceramics at the lowest possible temperatures [56,57]. The absence of hard agglomerates in the starting powder is crucial for the production of optically transparent, fully dense ceramics [33] that can be used as the active body of solid state lasers instead of single crystals [58][59][60].…”

Section: Precipitated and Co-precipitated Cryogelsmentioning

confidence: 98%

Inorganic Cryogels

Shlyakhtin¹

2014

Polymeric Cryogels

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Section: Precipitated and Co-precipitated Cryogelsmentioning

confidence: 98%

Inorganic Cryogels

Shlyakhtin¹

2014

Polymeric Cryogels

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“…Liquid phase-assisted sintering of single phase Zn 3 Nb 2 O 8 powders, obtained from coprecipitated precursors, at T = 740-780 • C allows to obtain microwave dielectric ceramics with 94-95% density, ε r = 20.2-20.8 and Q × F = 30 000-36 000 GHz. Further optimization of powder synthesis and processing conditions allowed to reduce the sintering temperature of Zn 3 Nb 2 O 8 ceramics down to 680 • C [20].…”

Section: Binbomentioning

confidence: 99%

“…Taking into account that the formation of ZnNb 2 O 6 is kinetically preferable, the synthesis of Zn 3 Nb 2 O 8 powders with T s < 800 • C requires a careful optimization of processing conditions. More detailed discussion of the Zn 3 Nb 2 O 8 formation from freeze dried precursors can be found elsewhere [20].…”

Section: Binbomentioning

confidence: 99%

Liquid phase low temperature sintering of niobate and cerate fine powders

Shlyakhtin

Orlov

2006

J Electroceram

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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 BiNbO 4 powders with CuO/V 2 O 5 causes reducing sintering temperatures from 850-900 • C to 700-720 • C. Similar doping of Zn 3 Nb 2 O 8 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 BaCeO 3 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.

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“…Interesting feature observed during these studies dealt with maximum sintering activity that was never observed for the powders with minimum grain size. Simultaneous promotion of the intensive grain growth during sintering allowed to produce microwave dielectric materials with Q Â F ¼ 20000 À 35000 GHz [101][102][103].…”

Section: Dense Ceramic Materials From Cryogel Precursorsmentioning

confidence: 99%

Inorganic cryogels for energy saving and conversion

Shlyakhtin

2008

J Electroceram

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Cryogels are usually obtained by freezing and thawing or freeze drying of gels and residues. Essential morphological features of the cryogels are bimodal pore size distribution, nanosize of the primary particles (crystallites) and their low agglomeration. Widely used for a decades in the polymer science and technology, cryogels find now a growing number of applications in the electroceramic materials. Freeze casting technique based on the freeze gelation effect is proved to be useful forming method in the production of complex-shaped SiO 2 -containing electroceramics. Directed modification of the micromorphology by using solvent exchange schemes allows to obtain SiO 2 cryogel monoliths with density ≤ 0.05 g cm −3 and specific surface area 700-800 m 2 g −1 suitable for cryogenic thermal insulation of the superconducting devices. Excellent electrocatalytic activity of the macro/mesoporous PtRu/C cryogels in the methanol oxidation reaction makes them perspective anode materials of direct methanol fuel cells. Application of the cryogel-derived starting powders promoted substantial reduction of the sintering temperatures for a number of electroceramic materials. MnO 2 -and V 2 O 5 -based cryogels are efficient cathode materials for secondary lithium batteries with specific capacity up to 300 mAh g −1 .Recent studies demonstrated also a feasibility of cryochemical approaches to the synthesis of complex oxide-based nanocrystalline electrode materials for electrochemical supercapacitors with high specific capacity at current densities up to 50 mA cm −2 .

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Low Temperature Sintering of Zn₃Nb₂O₈ Ceramics from Fine Powders

Cited by 34 publications

References 42 publications

Inorganic Cryogels

Inorganic Cryogels

Liquid phase low temperature sintering of niobate and cerate fine powders

Inorganic cryogels for energy saving and conversion

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