Kim, SH Moon, JH Park, JH Park, JG Kim, Y 2024-01-21T13:03:37Z 2024-01-21T13:03:37Z 2021-09-05 2001-01 0884-2914 https://pubs.kist.re.kr/handle/201004/140812 The thermal activation energies for conduction of Nb-doped SrTiO3 grains and grain boundaries have been investigated by impedance spectroscopy. First, to observe the effect of electrode/SrTiO3 bulk interface, the varied impedances of SrTiO3 single crystal were measured with temperatures. The activation energy of an electrode/bulk interface was determined to be 1.3 eV, whereas that of bulk was 0.8 eV. When the impedances of Nb-doped SrTiO3 ceramics were measured, it was suggested that the more precise impedance values of a single grain and a single grain to grain junction be obtained using a microelectrode method. The activation energies for a grain, a grain boundary, and an electrode/bulk interface were determined to be about 0.8, 1.3, and 1.5 eV, respectively. From these measured results, it was suggested that the activation energy, 0.8 eV, measured in grain was originated from oxygen vacancies and the activation energy, 1.3 eV, in grain boundary was from strontium vacancies. English CAMBRIDGE UNIV PRESS GRAIN-BOUNDARY DIELECTRIC-RELAXATION JOSEPHSON-JUNCTIONS BARIUM-TITANATE MICROSTRUCTURE CHEMISTRY CAPACITOR Analysis of defect formation in Nb-doped SrTiO3 by impedance spectroscopy Article 10.1557/JMR.2001.0031 1 JOURNAL OF MATERIALS RESEARCH, v.16, no.1, pp.192 - 196 JOURNAL OF MATERIALS RESEARCH 16 1 192 196 scie scopus 000166281200031 2-s2.0-0035239648 Materials Science, Multidisciplinary Materials Science Article GRAIN-BOUNDARY DIELECTRIC-RELAXATION JOSEPHSON-JUNCTIONS BARIUM-TITANATE MICROSTRUCTURE CHEMISTRY CAPACITOR thermal activation energy