Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Hydrothermal Synthesis and Structural Characterization of x mol% Calcia-Stabilized ZrO2 Nanopowders

x mol% 칼시아-안정화 지르코니아 나노분말의 수열합성 및 구조적 특성평가

  • Ryu, Je-Hyeok (Department of Materials Science and Engineering, Graduate School of PaiChai University) ;
  • Moon, Jung-In (Department of Materials Science and Engineering, Graduate School of PaiChai University) ;
  • Park, Yeon-Kyung (Department of Materials Science and Engineering, Graduate School of PaiChai University) ;
  • Nguyen, Tuan Dung (Department of Materials Science and Engineering, Graduate School of PaiChai University) ;
  • Song, Jeong-Hwan (Department of Information and Electronic Materials Engineering, PaiChai University) ;
  • Kim, Taik-Nam (Department of Information and Electronic Materials Engineering, PaiChai University)
  • 류제혁 (배재대학교 대학원 재료공학과) ;
  • 문정인 (배재대학교 대학원 재료공학과) ;
  • 박연경 (배재대학교 대학원 재료공학과) ;
  • ;
  • 송정환 (배재대학교 정보전자소재공학과) ;
  • 김택남 (배재대학교 정보전자소재공학과)
  • Received : 2012.03.05
  • Accepted : 2012.04.27
  • Published : 2012.05.27
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Abstract

Pure zirconia and $x$ mol% calcia partially stabilized zirconia ($x$ = 1.5, 3, and 8) nanopowders were synthesized by hydrothermal method with various reaction temperatures for 24 hrs. The precipitated precursor of pure zirconia and $x$ mol% calcia doped zirconia was prepared by adding $NH_4OH$ to starting solutions; resulting sample was then put into an autoclave reactor. The optimal experimental conditions, such as reaction temperatures and times and amounts of stabilizer CaO, were carefully studied. The synthesized $ZrO_2$ and $x$ mol% CaO-$ZrO_2$ ($x$ = 1.5, 3, and 8) powders were characterized by XRD, SEM, TG-DTA, and Raman spectroscopy. When the hydrothermal temperature was as low as $160^{\circ}C$, pure $ZrO_2$ and $x$ mol% CaO-$ZrO_2$ ($x$ = 1.5 and 3) powders were identified as a mixture of monoclinic and tetragonal phases. However, a stable tetragonal phase of zirconia was observed in the 8 mol% calcia doped zirconia nanopowder at hydrothermal temperature above $160^{\circ}C$. To observe the phase transition, the 3 mol% CaO-$ZrO_2$ and 8 mol% CaO-$ZrO_2$ nanopowders were heat treated from 600 to $1000^{\circ}C$ for 2h. The 3 mol% CaO-$ZrO_2$ heat treated at above $1000^{\circ}C$ was found to undergo a complete phase transition from mixture phase to monoclinic phase. However, the 8 mol% calcia doped zirconia appeared in the stable tetragonal phase after heat treatment. The result of this study therefore should be considered as the preparation of 8 mol% CaO-$ZrO_2$ nanopowders via the hydrothermal method.

Keywords

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