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排序方式: 共有109条查询结果,搜索用时 15 毫秒
1.
Takeo Tokiai Takashi Uesugi Kunihito Koumoto 《Journal of the American Ceramic Society》1995,78(4):1089-1092
High thermoelectric figure of merit semiconducting ceramics of n -type iron disilicide with modified local compositions have been developed. Sintering and annealing of the composite powder composed of iron disilicide and precipitated cobalt (II) hydroxide resulted in the dissolution of excess Co and oxygen into the iron disilicide phase. Excess Co segregated to the grain boundary region, while interstitially incorporated oxygen was distributed homogeneously in the microstructure. The maximum figure of merit achieved was 5.2 × 10−4 /K at 673 K. 相似文献
2.
Kunihito Koumoto Shunji Takeda Chul Hoon Pai Takayori Sato Hiroaki Yanagida 《Journal of the American Ceramic Society》1989,72(10):1985-1987
Structural images of the stacking faults in β-SiC were obtained with a high-resolution electron microscope. Stacking faults initially present in β-SiC powder particles were eliminated as grain growth proceeded at elevated temperatures. 相似文献
3.
4.
Ryosuke Ueyama Masahiro Harada Tamotu Ueyama Takashi Yamamoto Tadashi Shiosaki Kiyoshi Kuribayashi Kunihito Koumoto Won Son Seo 《Journal of Materials Science: Materials in Electronics》2000,11(2):139-143
Ultrafine BaTiO3 particles were prepared by a micro-emulsion charring (MEC) method. The MEC method consisted of two steps. The first step is the preparation of a water/oil micro-emulsion with BaTiO3 elements, and the second is a low temperature firing process in N2 atmosphere, which includes charring of oil in an emulsion and powdering BaTiO3 particles with the char. The char formed around BaTiO3 particles prevents an agglomeration of BaTiO3 particles during firing. In the present experiment, the W/O ratio and the amount of emulsifier greatly influenced the size of droplets of the emulsion. The charring temperature was another important experimental factor in order to obtain the desired BaTiO3 particles. The finally obtained BaTiO3 charring powders were monodispersed spherical particles and the particle size was 0.1 m to 0.5 m. 相似文献
5.
6.
Ning Wang Huawei Li Yaoshuai Ba Yifeng Wang Chunlei Wan Kyoichi Fujinami Kunihito Koumoto 《Journal of Electronic Materials》2010,39(9):1777-1781
The effect of yttria-stabilized zirconia (YSZ) with a low thermal conductivity on the thermoelectric properties of Nb-doped
SrTiO3 bulk materials, which were fabricated by the conventional normal pressure sintering method in an Ar atmosphere, was examined.
YSZ additions reduced the thermal conductivity but significantly enhanced the electrical conductivity. However, the Seebeck
coefficient was nearly independent of YSZ content. Thus, the ZT value was enhanced, and a sample with 3 wt.% YSZ displayed the maximum ZT value, 0.21, at 900 K. Additionally, the reason for the reduced thermal conductivity and enhanced electrical conductivity
by YSZ additions was investigated in detail. 相似文献
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8.
Chul-Hoon Pai Yasuhiro Sasaki Kunihito Koumoto Hiroaki Yanagida 《Journal of the American Ceramic Society》1991,74(11):2922-2924
Porous SiC ceramics fabricated from hollow particles and polycarbosilane (PSC) are promising materials for high-temperature thermoelectric energy conversion. Reaction sintering of PCS-impregnated compacts of SiC hollow particles gave rise to porous microstructures with the hollow shape remaining. The repetition of the PCS-impregnation and sintering process resulted in only a slight increase in density but in a great improvement in thermoelectric properties. 相似文献
9.
Kiyofumi Katagiri Hitoshi Inami Tomohide Ishikawa Kunihito Koumoto 《Journal of the American Ceramic Society》2009,92(S1):S181-S184
A low-temperature procedure for the synthesis of TiO2 was developed using a water-soluble titanium complex and enzymes. Titanium–lactate and titanium–glycolate complexes were used as precursors of TiO2 . Digestive enzymes were chosen as biocatalysts for the synthesis of TiO2 in aqueous solutions. TiO2 powders were deposited from reaction solutions having optimal pH values for the enzymes to exhibit their catalytic activities for their original substrates. TiO2 has been synthesized by an enzymatic reaction in an aqueous solution under ambient conditions. The XRD measurements indicated that TiO2 powders thus obtained usually have an amorphous phase. However, after calcination at 550°C, the anatase phase was confirmed. Interestingly, the minor phase of TiO2 , brookite, was found in the sample obtained from the titanium–glycolate complex catalyzed by lipase at pH 10 after calcination at 550°C. 相似文献
10.
Kimihiro Yamashita Kunihito Koumoto Hiroaki Yanagida Takashi Hamano 《Journal of the American Ceramic Society》1984,67(2):31-C-
Mechanical and dielectric strengths were measured for BaTiO3 , ceramics at room temperature. The results were evaluated in terms of Weibull statistics, and a clear analogy between the mechanical and dielectric strength distributions was found. 相似文献