錯体沈殿法によるLaCr0_3の合成とその電気伝導度

概要

論文の詳細を見る
A well-crystallized LaCrO_3 powder with a primary particle size of about 1μm was synthesized through the complex precipitation process ; obtaining the precipitate of complex hydroxide from an NaOH aqueous solution of Cr(NO_3) by adding LaCl_3 and then heating the precipitate up to 700℃. The LaCrO_3 single-phased powder was prepared from the precipitate obtained by adding less amount of La^<3+> than the equimolar ratio, but an excess adding of La^<3+> resulted in La_2CrO_6 with LaCrO_3. From density measurements and SEM observations, the powder thus prepared has no remarkable sinterability. However, the electrical conductivity (about 0.069 Sl/cm) of the specimen, of which relative density was as low as 57%, was comparable with those reported on the dense specimen. The temperature dependence of conductivity of the present specimen showed a break around 180℃. The activation energy was determined as 0.20 and 0.23 eV above and below 180℃, respectively.
社団法人日本セラミックス協会の論文
1990-07-01