收录:
摘要:
Ca2Co2O5 textured ceramics were rapidly prepared by a coprecipitation method and spark plasma sintering (SPS) using cobalt and calcium nitrates as starting materials and sodium hydroxide as precipitant. Single phase Ca2Co2O5 ceramics can be obtained by SPS at 800 degrees C for 5 min using the precursor powders calcined at 700-850 degrees C for 2 h. It is critical to obtain stochiometric precursor by controlling the final pH 13.2 during the coprecipitation process. The SPS process is effective in obtaining single phase Ca2Co2O5 ceramics. The thermoelectric properties of the prepared sample were investigated from 100 to 700 degrees C. At 700 degrees C, the electrical resistivity, Seebeck coefficient, thermal conductivity and figure of merit of the sample are 9.30 x 10(-5) Omega m, 178 mu V/K, 1.55 W/mK and 0.21, respectively. (c) 2005 Elsevier B.V. All rights reserved.
关键词:
通讯作者信息:
电子邮件地址:
来源 :
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN: 0925-8388
年份: 2005
期: 1-2
卷: 399
页码: 64-68
6 . 2 0 0
JCR@2022
ESI学科: MATERIALS SCIENCE;
JCR分区:1