Characterization of Ba<inf>0.77</inf>Sr<inf>0.23</inf>TiO<inf>3</inf> powder prepared from an oxalate co-precipitation and an impregnation method

• Main Authors: Pookmanee P., Phanichphant S.
• Format: Journal
• Published: 2017
• Online Access: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=77958197299&origin=inward; http://cmuir.cmu.ac.th/jspui/handle/6653943832/43218
• Institution: Chiang Mai University

Barium titanate (BaTiO 3 ) powder was prepared from an oxalate co-precipitation method with the starting precursors of barium chloride dihydrate and potassium titanium oxalate dihydrate with mole ratio of 1: 1. Precipitated powder was obtained after adding oxalic acid until the pH of the final solution was 2. The precipitated powder was milled and calcined at 700°C for 2 h. Sr-doped barium titanate (BaSrTiO 3 ) powder was prepared by an impregnation method. Barium titanate calcined at 700 o C for 2 h was mixed with 2 and 4 mole % of Sr from strontium chloride hexahydrate. The mixed powder was calcined at 900°C for 2 h. The phase of Ba 0.77 Sr 0.23 TiO 3 powder was studied by X-ray diffraction (XRD) and found to have a tetragonal structure after calcination at 900°C for 2 h. The morphology and chemical composition of Ba 0.77 Sr 0.23 TiO 3 powder were investigated by a scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS). The particle size of Ba 0.77 Sr 0.23 TiO 3 powder was in the range of 0.2-0.3 μm with an irregular shape. The elemental composition of barium, strontium, titanium and oxygen showed the characteristic X-ray energy values.