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Sintering behavior of large size, Sm-doped ceria solid electrolyte disk
Yoshihiro Hirata,Yukio Yoshimura,Soichiro Sameshima,Hidekazu Sueyoshi,Toshiya Doi,Teruhisa Horit 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.4
The sinterability of a submicrometre-sized Sm-doped ceria solid solution powder(SDC, powder A) with a composition of Ce0.8Sm0.2O1.9 and a mechanically mixed submicrometre-sized Sm2O3-CeO2 powder (powder B) was studied at 1300-1550 oC in air in order to make a practical solid electrolyte disk of 150 mm diameter. No phase change was observed in powder A heated at 600-1550 oC. The Sm2O3 component in powder B dissolved into the CeO2 powder at temperatures above 1500 oC. The sinterability of powder A was higher than powder B. The formation of SDC in powder B at 1500-1550 oC enhanced the sinterability. No cracks and no warps were observed in the small (10 mm diameter) and large (150 mm diameter) disks after sintering at 1300-1550 oC. The uniformity of microstructure was higher for the disk from powder A than from powder B.
Observations of Weak Heat Flux due to Phase Transitions in CsPbX3(X=Cl, Br)
Hironori Hiraoka,Akira Kojima,Hiroshi Iwasaki,Katsuei Higashi,Ken-ichi Tozaki,Yukio Yoshimura 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
We have established a system for detecting weak heat ux due to phase transitions by a combination of DTA by using the mK-stabilized cell" previously developed and treatment by both the moving average and the box car integrator by using a personal computer. By the system, the existence of a phase transition in CsPbCl3 was conrmed, having been observed by our X-ray diraction study, and the phase transition series was reported to be predominant, having a heterostructure. Weak heat ux was also observed in CsPbBr3, having been conrmed to be phase transitions by X-ray diraction. The phase transition temperatures in CsPbX3(X = Cl, Br) recognized by the heat ux measurements are in excellent agreement with the results of NQR measurements.