HYDROTHERMAL SYNTHESIS AND SINTERING OF ULTRAFINE CEO2 POWDERS

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	HYDROTHERMAL SYNTHESIS AND SINTERING OF ULTRAFINE CEO2 POWDERS
	Y. C. Zhou ; M. N. Rahaman
刊名	Journal of Materials Research
	1993
卷号	8 期号:7 页码:1680-1686
关键词	nanocrystalline tio2 nanophase tio2
ISSN号	0884-2914
中文摘要	Undoped CeO2 and Y2O3-doped CeO2 powders, with particle sizes of almost-equal-to 10-15 nm, were prepared under hydrothermal conditions of 10 MPa at 300-degrees-C for 4 h. The compacted powders were sintered freely in air or in O2 at constant heating rates of 1-10-degrees-C/min up to 1350-degrees-C. The undoped CeO2 started to sinter at almost-equal-to 800-900-degrees-C and reached a maximum density of 0.95 of the theoretical at 1200-degrees-C, after which the density decreased slightly. Isothermal sintering at 1150-degrees-C produced a sample with a relative density of almost-equal-to 0.98 and an average grain size of almost-equal-to 100 nm. The samples sintered above 1200-degrees-C exhibited microcracking. The decrease in density and the microcracking above 1200-degrees-C are attributed to a redox reaction leading to the formation of oxygen vacancies and the evolution Of O2 gas. Doping with Y2O3 produced an increase in the temperature at which measurable sintering commenced and an increase in the sintering rate, compared with the undoped CeO2. Sintered samples of the doped CeO2 showed no microcracks. The CeO2 doped with up to 3 mol % Y2O3 was sintered to almost full density and with a grain size of almost-equal-to 200 nm at 1400-degrees-C.
原文出处	://WOS:A1993LJ82400027
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/39193]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. C. Zhou,M. N. Rahaman. HYDROTHERMAL SYNTHESIS AND SINTERING OF ULTRAFINE CEO2 POWDERS[J]. Journal of Materials Research,1993,8(7):1680-1686.
APA	Y. C. Zhou,&M. N. Rahaman.(1993).HYDROTHERMAL SYNTHESIS AND SINTERING OF ULTRAFINE CEO2 POWDERS.Journal of Materials Research,8(7),1680-1686.
MLA	Y. C. Zhou,et al."HYDROTHERMAL SYNTHESIS AND SINTERING OF ULTRAFINE CEO2 POWDERS".Journal of Materials Research 8.7(1993):1680-1686.