Kim, SH Seon, HW Kim, HT Park, JG Kim, YH Byun, JD 2024-01-21T15:33:14Z 2024-01-21T15:33:14Z 2022-01-11 1999-05-31 0921-5107 https://pubs.kist.re.kr/handle/201004/142182 The effect of MnO addition on the microstructure and electrical properties of Nb-doped SrTiO3 varistors was investigated by using scanning electron microscopy, I-V and C-V measurement, complex-capacitance plane analysis, and impedance spectroscopy. It was observed that the grain Size and dielectric constant of the ceramics decreased with increasing MnO content. The non-linearity coefficient defining varistor characteristics increased significantly from 5 to 43 as the MnO content increased from 0 to 0.03 mol%. The addition of MnO brought on changes in the gain boundary electronic states: as the MnO content increased, the potential barrier height and the breakdown voltage increased but the charge carrier concentration decreased. This behavior was explained through the effect of Mn ions substituting for Ti sites. The substitutional defect Mn'(Ti)' (or Mn'(Ti)), formed in both grain boundary region and grain interior, acts as an electron-trap. (C) 1999 Elsevier Science S.A. All rights reserved. English ELSEVIER SCIENCE SA BOUNDARY-LAYER CAPACITORS ZINC-OXIDE STRONTIUM-TITANATE GRAIN-BOUNDARIES BARIUM-TITANATE ZNO VARISTORS CERAMICS TEMPERATURE SEGREGATION ACCEPTOR Effect of MnO addition on the electrical properties of Nb-doped SrTiO3 varistor Article 10.1016/S0921-5107(98)00451-6 1 MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, v.60, no.1, pp.12 - 20 MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY 60 1 12 20 scie scopus 000080739200002 2-s2.0-0032629565 Materials Science, Multidisciplinary Physics, Condensed Matter Materials Science Physics Article BOUNDARY-LAYER CAPACITORS ZINC-OXIDE STRONTIUM-TITANATE GRAIN-BOUNDARIES BARIUM-TITANATE ZNO VARISTORS CERAMICS TEMPERATURE SEGREGATION ACCEPTOR strontium titanate varistor grain boundary potential barrier donor concentration microelectrode