화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.25, No.7, 317-321, July, 2015
DOI10.3740/MRSK.2015.25.7.317  Export Citation
Dielectric and Ferroelectric Properties of Nb Doped BNT-Based Relaxor Ferroelectrics
Adnan Maqbool, Ali Hussain, Rizwan Ahmed Malik, Arif Zaman, Tae Kwon Song, Won-Jeong Kim1, and Myong-Ho Kim†
  • School of Advanced Materials Engineering, Changwon National University, Gyeongnam 641-773, Korea
  • 1Department of Physics, Changwon National University, Gyeongnam 641-773, Korea
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The effects of Nb doping on the crystal structure, microstructure, and dielectric ferroelectric and piezoelectric properties of (Bi0.5Na0.5)0.935Ba0.065Ti(1-x)NbxO3-0.01SrZrO3 (BNBTNb-SZ, with x = 0, 0.01 and 0.02) ceramics have been investigated. X-ray diffraction patterns revealed that all ceramics have a pure perovskite structure with tetragonal symmetry. The grain size of the ceramics slightly decreased and a change in grain morphology from square to spherical shape was observed in the Nb-doped samples. The maximum dielectric constant temperature (Tm) increases with increasing amount of Nb; however, ferroelectric-relaxor transition temperature (TF-R) and maximum dielectric constant (εm) values decrease gradually. Nb addition disrupted the polarization hysteresis loops of the BNBT-SZ ceramics by leading a reduction in the remnant polarization coercive field and piezoelectric constant.
Keywords:lead-free;ferroelectricity;dielectric properties;relaxor ferroelectrics
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