Novel hydroxide precursors for low temperature synthesis of selected ternary oxides

Muthurajan, H.; Rao, N. Koteswara; Gupta, Upendra Nath; Pradhan, Sayantan; Jha, Rani; Kumar, H. H.; Mirji, Santosh; Ravi, V.

doi:10.1016/j.materresbull.2007.07.006

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…The densification behaviour can be improved and thus the sintering temperature reduced by using fine-grained powders and sintering additives [32,33,34]. Apart from the mixed-oxide method, which results in coarse-grained powders, some wet chemical syntheses have been developed to obtain fine-grained BaCeO 3 powders such as various precursor complex methods, solvothermal-and sol-gel syntheses [35,36,37,38,39,40,41]. Pechini based routes are reported by Lee at al.…”

Section: Compacts On the Basis Of Baceo 3 Generally Reveal Only A Modmentioning

confidence: 99%

Sintering of a fine-grained BaCeO3 powder obtained from a co-precipitation method

2010

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The formation of BaCeO 3 by a co-precipitation method is described herein. The coprecipitation route leads to an orange (BaCe)-precursor powder (1). To improve the sintering behaviour, a small amount of Ge 4+ was incorporated, leading to a (BaCe 0.95 /Ge 0.05)-precursor (2). Both precursor powders results in fine-grained preceramic powders (1A, 2A) after calcination. The shrinkage and sintering behaviour of resulting powder compacts were studied in comparison to a coarse-grained mixed-oxide BaCeO 3 powder (3). Compacts of 2A reach a relative density of 90 % after sintering at 1350 °C with grain-sizes between 0.9−3.2 µm. On the other hand ceramics of 1A and 3 have, after sintering at 1500 °C (10 h), relative densities of 85 % and 76 %, respectively. Ceramic bodies of 1A consisted of phase-pure orthorhombic BaCeO 3 , whereas bodies of 2A show reflections of BaCeO 3 and a Ba 2 GeO 4 phase. DTA investigations of samples 1A and 2A reveal three phase transitions at 255 °C (1A) and 256 °C 2 (2A) as well as 383 °C (1A) and 380 °C (2A). A very weak one can be obtained in the range 880−910 °C.

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Section: Compacts On the Basis Of Baceo 3 Generally Reveal Only A Modmentioning

confidence: 99%

Sintering of a fine-grained BaCeO3 powder obtained from a co-precipitation method

2010

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“…In general, powders with high specific surface areas can improve the catalytic activity, the densification behaviour of compacts, and lead to ceramic bodies with a fine-grained microstructure [33,34,35]. Kim et al [36] reported on the effect of fine-and coarse-grained [29,37,38,39,40,41,42]. Nano-sized powders via Pechini based routes are reported by Lee at al.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a nano-scaled barium cerate perovskite powder using starch as polymerization agent

Köferstein

Hesse

Ebbinghaus

2018

Preprint

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The preparation of nano-sized BaCeO3 powder using starch as a polymerizationagent is described herein. Phase evolution during the decomposition process of a (BaCe)-gelwas monitored by XRD. A phase-pure nano-sized BaCeO3 powder was obtained aftercalcining of the (BaCe)-gel at 920 °C. The resulting powder has a specific surface area of 15.4m2/g. TEM investigations reveal particles mainly in the size range of 30 to 65 nm. Theshrinkage and sintering behaviour of resulting powder compacts were studied in comparisonto a coarse-grained mixed-oxide BaCeO3 powder (SBET = 2.1 m2/g). Dilatometricmeasurements show that the beginning of shrinkage of compacts from the nano-sized powder is downshifted by 300 °C compared to mixed-oxide powder. Compacts from the nano-sizedpowder reach a relative density of 91 % after sintering at 1450 °C for 10 h.

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“…Kim et al [36] reported on the effect of fine-and coarse-grained BaCeO 3 on the microstructure and the critical current density of a melt-textured YBa 2 Cu 3 O 7−y . Since the mixed-oxide method mostly results in coarse-grained powders some wet chemical syntheses have been developed to obtain fine-grained or nano-scaled BaCeO 3 powders such as various precursor complex methods, solvothermal-and sol-gel syntheses [29,37,38,39,40,41,42]. Nano-sized powders via Pechini based routes are reported by Lee at al.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a nano-scaled barium cerate perovskite powder using starch as polymerization agent

2011

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Synthesis and characterization of a nanoscaled barium cerate perovskite powder using starch as polymerization agent. Solid State Ionics, Elsevier, 2011, 203 (1), pp.Abstract. The preparation of nano-sized BaCeO 3 powder using starch as a polymerization agent is described herein. Phase evolution during the decomposition process of a (BaCe)-gel was monitored by XRD. A phase-pure nano-sized BaCeO 3 powder was obtained after calcining of the (BaCe)-gel at 920 °C. The resulting powder has a specific surface area of 15.4 m 2 /g. TEM investigations reveal particles mainly in the size range of 30 to 65 nm. The shrinkage and sintering behaviour of resulting powder compacts were studied in comparison to a coarse-grained mixed-oxide BaCeO 3 powder (S BET = 2.1 m 2 /g). Dilatometric measurements show that the beginning of shrinkage of compacts from the nano-sized powder 2 is downshifted by 300 °C compared to mixed-oxide powder. Compacts from the nano-sized powder reach a relative density of 91 % after sintering at 1450 °C for 10 h.

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Novel hydroxide precursors for low temperature synthesis of selected ternary oxides

Cited by 7 publications

References 34 publications

Sintering of a fine-grained BaCeO3 powder obtained from a co-precipitation method

Sintering of a fine-grained BaCeO3 powder obtained from a co-precipitation method

Synthesis and characterization of a nano-scaled barium cerate perovskite powder using starch as polymerization agent

Synthesis and characterization of a nano-scaled barium cerate perovskite powder using starch as polymerization agent

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