Journal of Inorganic Materials

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Preparation of Nanocrystalline Ba3(Ca1.18Nb1.82)O9-δ Powder by UsingCitrate Sol-Gel Method

SU Xin-Tai; LIU Rui-Quan; HU Yun-Xia; XIE Ya-Hong; WANG Ji-De   

  1. College of Chemistry & Chemical Engineering; Xinjiang University; Urumqi 830046; China
  • Received:2002-11-11 Revised:2002-12-16 Published:2004-01-20 Online:2004-01-20

Abstract: Ba3(Ca1.18Nb1.82)O9-δ(BCN18) powders were synthesized by using a wet chemical method from a mixture of all
water-soluble compounds including Ba, Ca and Nb-citrate. Heating a mixed aqueous solution with the molar ratio of Ba:Ca:Nb:citric acid=3:1.18:1.82:12
produced a light green gelatinous viscous matter without any precipitation, then evaporating, drying and calcinating were conducted. The obtained gels
were characterized by TG-DTA, XRD and TEM. The experimental results show that the heating temperature is 750℃ for getting the powder and
the average particle size is about 50nm. Furthermore a pure BCN18 phase with a complex perovskite structure forms at 1000℃,it is lower about
600℃ than that reported by using the traditional solid-reaction method. The citrate sol-gel method is more practical and ascendant than the wet-chemical method used to the alcohol salt system reported in present literature.

Key words: Ba3(Ca1.18Nb1.82)O9-δ(BCN18), sol-gel method, high temperature proton conductors, complex perovskite

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