Effect of $MnO_2$ Addition on the Electric Properties in Pb($Mg_{1/3}Nb_{2/3}$)$O_3$ Relaxor Ferroelectrics

$MnO_2$ 첨가에 따른 Pb($Mg_{1/3}Nb_{2/3}$)$O_3$계 완화형 강유전체에서의 전기적 물성변화

  • 박재환 (한국과학기술연구원 재료공학부)
  • Published : 2001.07.01

Abstract

The effects of MnO$_2$ addition on the properties in Pb(Mg$_{1}$3/Nb$_{2}$3/)O$_3$ relaxor ferroelectrics were studied in the phase transition temperature range from -4$0^{\circ}C$ to 11$0^{\circ}C$. Specimens were made via solid state processing method. Dielectric properties, piezoelctric properties, electric-field-induced strain were examined to clarify the effect of MnO$_2$ addition in 0.9MN-0.1PT. As the amount of MnO$_2$ increases, the maximum dielectric constant and the dielectric loss decreases. Q$_{m}$ increased by increasing the doping contents of Mn. When 0.5wt% MnO$_2$ was doped, Q$_{m}$ increased from 95 to 480. The electric-filed-induced strain and polarization decreases as the amount of MnO$_2$ increases. From the experimental results, it was suggested that Mn behaves as an ferroelectric domain pinning element.ent.

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