20-22 May 2015
Asia/Bangkok timezone
The Centennial Celebration of General Relativity Theory and 80 Years of Thai Physics Graduate

Phase structure and microstructure of CaZrO3 powder prepared by molten salt method

21 May 2015, 09:30
15m
Hemingways' Lounge ()

Hemingways' Lounge

Oral presentation Atomic Physics, Quantum Physics, Molecular and Chemical Physics Atomic Physics, Quantum Physics, Molecular and Chemical Physics

Speaker

Ms Wasuporn Hirunsit (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

Description

Lead-free calcium zirconate (CaZrO3) is an important raw material for industry applications because of its excellent thermal and electrical properties such as, high dielectric constant and low dielectric loss [1]. However, in order to achieve pure CaZrO3 powder, high calcining temperatures ( 1300 $^\circ$C) and long dwelling times for solid reactions between the CaCO3 and ZrO2 powders are required [2]. It is well known that the molten-salt method can synthesize powders at lower temperatures and is a simple technique. Thus, this work is to investigate the preparation of lead-free CaZrO3 powder by the molten salt method. The starting powders of CaZrO3 were weighed, mixed and ball-milled. After that, they were mixed with KCl:NaCl salt in the ratio of 1:1. Then calcined at temperatures of 900-1050 $^\circ$C and washed with hot-distilled water. Phase formation and microstructure of CaZrO3 powders were studied by using an X-ray diffractometer (XRD) and scanning electron microscope (SEM). The phase structure of the powder corresponded to CaZrO3 peaks (JCPDS No. 035-0590). Moreover, uniform particle size, agglomerated particles and equiaxed grains of CaZrO3 powders were observed.

Primary author

Ms Wasuporn Hirunsit (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

Co-author

Mr Sukum Eitssayeam (Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand)

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