Solvothermal Synthesis, Sintering Behavior and Dielectric Properties of Potassium Niobate Fine Powders
Kittichai Jinachai [a], Athipong Ngamjarurojana [b] and Apinpus Rujiwatra*[a]* Author for corresponding; e-mail address: apinpus@gmail.com
Volume: Vol.38 No.2 (APRIL 2011)
Research Article
DOI:
Received: 22 July 2010, Revised: -, Accepted: 30 December 2010, Published: -
Citation: Jinachai K., Ngamjarurojana A. and Rujiwatra A., Solvothermal Synthesis, Sintering Behavior and Dielectric Properties of Potassium Niobate Fine Powders, Chiang Mai Journal of Science, 2011; 38(2): 252-262.
Abstract
Fine potassium niobate powders composing of sub-micrometer sized lumber particles were synthesized under solvothermal conditions, with the use of mixed water-ethyl alcohol as the reaction medium and the application of the prior ultrasonication as the activation step. The influences of ethyl alcohol on particle shape and size, and the prior ultrasonication on the sintering behavior of the synthesized powders are present and discussed in relative to the conventional hydrothermal cases. The temperature dependent dielectric constants (εr) and dielectric losses (tan δ) of the sintered ceramics are also included, showing the origin of the losses to stem from the loss of potassium oxide in the sintering process. Keywords: potassium niobate, solvothermal synthesis, sonocatalyzation, sintering, dielectric property.