BaTiO3-based fine-grain ceramic with giant dielectric constant, low loss and high resistivity and preparation method of BaTiO3-based fine-grain ceramic

Abstract

The invention provides a BaTiO3-based fine-grain ceramic with a giant dielectric constant, low loss and high resistivity. The BaTiO3-based fine-grain ceramic is prepared from the following raw materials in parts by mole and MAS: 100 parts of BaTiO3; 0.2 to 2 parts of Ln2O3; 0.2 to 2 parts of MnO2; 0.05 to 2 parts of MgO; the Ln2O3 is one or more of Y2O3, H2O3, Dy2O3 and Sm2O3, and the Ln2O3 is one or more of Y2O3, H2O3, Dy2O3 and Sm2O3; the content of the MAS accounts for 0.5 wt%-3 wt% of the BaTiO3. Compared with the prior art, the BaTiO3-based fine-grain ceramic with the giant dielectric constant, the low loss and the high resistivity provided by the invention adopts components with specific contents, so that relatively good overall interaction is realized, and the obtained product overcomes the problems of relatively low dielectric constant, overlarge crystal grains, low resistivity and the like of most dielectric ceramic materials; the method has great potential in application to the field of MLCC; the ceramic prepared by the invention shows excellent performance: relative dielectric constant gt; 104, the dielectric loss is 0.01-0.05, and the resistivity is gt; 109 omega.cm, the crystal grains are fine (the grain size is 1t; the material belongs to an environment-friendly electronic material, and can meet the practical application requirements of a miniaturized and light multilayer ceramic capacitor (MLCC).

Description

technical field [0001] The present invention relates to the technical field of electronic ceramics and its manufacture, more specifically, relates to a kind of BaTiO with giant dielectric constant, low loss and high resistivity 3 Base fine-grained ceramics and its preparation method. Background technique [0002] With the rapid development of electrical equipment, miniaturization and high integration have become the inevitable development trend of various instruments. As the most widely used integrated passive device, multilayer ceramic capacitors (MLCC) are required to have high dielectric constant, low dielectric loss, and good temperature stability. However, most of the MLCC dielectric materials with high dielectric constant are extremely sensitive to the operating temperature, and the improvement of their temperature stability is often accompanied by the reduction of the dielectric constant, which makes it difficult for many MLCC dielectric materials to meet the needs o...

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the above-mentioned deficiencies of the prior art, provides a kind of BaTiO with giant dielectric constant, low loss and high resistivity and stable temperature 3 Based fine-grained ceramics and preparation methods thereof overcome the problems of low dielectric constant, excessively large crystal grains, and low resistivity in most dielectric ceramic materials, and have great potential for application in the field of MLCC; the ceramics prepared by the present invention in N 2 / H 2 Sintering under the atmosphere showed excellent performance: relative permittivity>10 4 , dielectric loss 0.01~0.05, resistivity>10 9 Ω cm, fine grains (particle size 3 The source of raw materials required for fine-grained ceramics is wide and cheap, and it is an environmentally friendly electronic material that can meet the practical application requirements of miniaturized and lightweight multilayer ceramic capacitors MLCC

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