Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Evaluations of Y2O3 Powder Synthesized Using Oxalic Acid

옥살산을 이용한 Y2O3 분말제조와 특성 평가

  • Son, Bo-Young (School of Biological Sciences and Chemistry/Institute of Basic Science, Sungshin Womens Univ.) ;
  • Jung, Mi-Ewon (School of Biological Sciences and Chemistry/Institute of Basic Science, Sungshin Womens Univ.)
  • 손보영 (성신여자대학교 생명과학.화학부/기초과학연구소) ;
  • 정미원 (성신여자대학교 생명과학.화학부/기초과학연구소)
  • Received : 2011.06.22
  • Accepted : 2011.07.27
  • Published : 2011.08.27
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Abstract

Nano-sized $Y_2O_3$ powders were prepared via a sol-gel method starting with $Y(NO_3)_3{\cdot}6H_2O$ (Yttrium(III) nitrate hexahydrate) and water with ethanol as a cosolvent. $Y_2O_3$ is an important rare earth oxide and has been considered for use in nuclear applications, such as ceramic materials, due to its excellent optical and refractory characteristics. It has been used as a chemically stable substrate, a crucible material for melting reactive metals, and a nozzle material for jet casting molten rare earth-iron magnetic alloys. Oxalic acid ($C_2H_2O_4$) has been adopted as a chelating agent in order to control the rate of hydrolysis and polycondensation, and ammonia was added in order to adjust the base condition. The synthesized $Y_2O_3$ powder was characterized using TG/DTA, XRD, FE-SEM, BET and Impedance Analyzer analyses. The powder changed its properties in accordance with the pH conditions of the catalyst. As the pH increases according to the FE-SEM, the grain grew and it showed that the pore size decreased while confirming the effect of the grain size. The nano-material $Y_2O_3$ powders demonstrated that the surface area was improved with the addition of oxalic acid with ammonium hydroxide.

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