Ultrafine powder of barium titanate for production of lead-free ceramic piezomaterials

Open School-Conference of NIS Countries Ultrafine Grained and Nanostructured Materials

Kholodkova, A.A.^1,2 ; Ponomarev, S.G.^1 ; Smirnov, A.D.^1 ; Ivakin, Y.D.^2 ; Danchevskaya, M.N.^1,2

Moscow Polytechnical University, B. Semenovskaya 38, Moscow

115280, Russia^1

Chemistry Department, Lomonosov Moscow State University, Leninskie Gory 1-3, Moscow

119991, Russia^2

关键词: Crystal size distributions;    High dielectric constants;    Lead free ceramics;    Medium frequencies;    Solid state method;    Solid state technology;    Supercritical water;    Ultra fine powder;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012074/pdf
DOI  :  10.1088/1757-899X/447/1/012074

来源: IOP

【 摘 要 】

The paper is aimed to perform and compare the capabilities of the solid state technology and a new method of synthesis in supercritical water for the production of barium titanate powder. This material is of interest for applications such as dense piezoceramics. The new method of synthesis in an aqueous medium allowed obtaining barium titanate of higher phase purity and with a narrow crystal size distribution compared to the solid state method. The ceramics manufactured from the barium titanate powder synthesized in supercritical water possessed a consistently high dielectric constant (2400-2600) and a low loss tangent (∼ 10-2) at low and medium frequencies.