한국전기전자재료학회논문지 (Journal of the Korean Institute of Electrical and Electronic Material Engineers)

  • 제23권12호
  • /
  • Pages.949-955
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  • 2010
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  • 1226-7945(pISSN)
  • /
  • 2288-3258(eISSN)
한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
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(Bi,Nd)(Fe,Ti)O3 세라믹스와 박막의 상형성 거동

Phase Evolution Behavior of (Bi,Nd)(Fe,Ti)O3 Ceramics and Thin Films

  • 김경만 (영남대학교 공과대학 신소재공학부) ;
  • 이희영 (영남대학교 공과대학 신소재공학부)
  • Kim, Kyung-Man (School of Materials Science and Engineering, Yeungnam University) ;
  • Lee, Hee-Young (School of Materials Science and Engineering, Yeungnam University)
  • 투고 : 2010.10.18
  • 심사 : 2010.11.04
  • 발행 : 2010.12.01
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초록

Nd and Ti co-doped bismuth ferrite $(Bi_{1-x}Nd_x)(Fe_{1-y}Ti_y)O_3$ (x, y = 0, 0.05, 0.1, 0.2) ceramics and thin films were synthesized through the conventional mixed-oxide process and pulsed laser deposition (PLD), respectively. Nd and Ti co-doping effect was examined with emphasis on how these impurities affect phase formation behavior as there could be the improvement in leakage current problems often associated with multiferroic $BiFeO_3$ (BFO) thin films. The lattice constants of BFO ceramics decreased with Nd doping concentration up to 10mol%, while they further decreased with Nd and Ti co-doping to about 20%. BFO thin films obtained by the PLD process revealed random polycrystalline structure. Similar to bulk BFO ceramic, Nd and Ti co-doping effectively suppressed the formation of unwanted secondary phase and thus stabilized the perovskite phase in BFO thin films.

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