Research and Development of new dielectric Ceramics

研究了介电性能与晶粒的olioliti、作为压电陶瓷起始材料的纤维颗粒的合成以及铁电居里点与元素组合的关系。主要研究具有钙钛矿型晶体结构，具有铁电性的材料。(1)创新了由纤维颗粒制成的钛酸钡陶瓷，具有特殊的压电现象。纤维钛酸钡的前驱体是钛酸钾。普通压电材料既有平面-伸展共振，也有厚度共振，但只有平面-伸展共振。(2)采用氢氧化物合成钛酸铅纤维。纤维溶液的产率与反应温度。测定所得的钛酸铅为四边形，纤维长度为50 ~ 100 μ m，直径为1 ~ 10 μ m。(3)说明了钙钛矿型铁电体的居里点高低。发现原子间键的共价键能与居里点有较高的相关性。具有较低共价键能的钙钛矿型氧化物具有较高的居里点。

Relation between dielectric properties and olientation of grains, synthesis of fibrous grains as starting materials of piezoelectric ceramics, and relation between ferroelectric Curie points and combination of elements were investigated. Materials having perovskite-type crystal structure, which tends to have ferroelectricity, was mainly dealed with.(1) Barium titanate ceramic which made of fibrous grains were inovated, which had a peculiar piezoelectric phenomena. The precurcer of the fibrous barium titanate was potassium titante. Only its planar-extensional resonance was observed and its thickness resonances were not, though ordinary piezoelectrics have both.(2) Lead titanate fibers were synthesized by a hydroxide. The yield of fibrous solution and the reaction temperature. The obtained lead titante was determined to be tetragonal and the fibers were 50-100 um in length and1-10 um in diameter.(3) What kinds of perovskite-type ferroelectrics show a high or low Curie point was illustrated. It was found that the covalent bond energy of interatomic bonding were showing high correlation with Curie points. Perovskite-type oxides with lower covalent bond energy show higher Curie points.