Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Thermal expansion and electrical properties of Fe-doped CaCu3Ti4O12 ceramics. / Zhuk, N. A.; Krzhizhanovskaya, M. G.; Sekushin, N. A.; Kharton, V. V.; Koksharova, L.
в: Materials Chemistry and Physics, Том 258, 123996, 01.01.2021.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
}
TY - JOUR
T1 - Thermal expansion and electrical properties of Fe-doped CaCu3Ti4O12 ceramics
AU - Zhuk, N. A.
AU - Krzhizhanovskaya, M. G.
AU - Sekushin, N. A.
AU - Kharton, V. V.
AU - Koksharova, L.
N1 - Publisher Copyright: © 2020 Elsevier B.V.
PY - 2021/1/1
Y1 - 2021/1/1
N2 - Thermal behavior and electrical properties of Fe-doped CaCu3Ti4O12 ceramics samples have been studied by high-temperature X-ray diffraction, thermal analysis, and impedance spectroscopy. According to X-ray diffraction data, samples of CaCu3Ti4-4хFe4хO12-δ and CaCu3-3хFe3хTi4O12+δ composition do not contain iron-containing impurity phases; in trace amounts may contain copper oxide (II). According to thermogravimetry data, no weight loss of samples was recorded before the melting start temperature (~1033 °C). The DSC curves of doped calcium-copper titanate samples show an exothermic effect in the range of 506–573 K, not associated with a phase transition, and an endothermic process, at a temperature above 1219 K, due to the dissociation of CuO. The thermal expansion coefficient for CaCu3Ti3,76Fe0.24O12-δ in the range of 298–1193 K changes continuously from 8.6 × 106 (298 К) to 11.4 × 106 °С−1 (1173 К). Based on the results of impedance spectroscopy, the electrical properties of the samples were simulated and an equivalent scheme was proposed. The samples exhibit ionic conductivity. The activation energy of conduction of the CaCu3Ti3.76Fe0.24O12-δ is 0.65 eV and 1.04 eV of the CaCu3-3хFe3хTi4O12+δ.
AB - Thermal behavior and electrical properties of Fe-doped CaCu3Ti4O12 ceramics samples have been studied by high-temperature X-ray diffraction, thermal analysis, and impedance spectroscopy. According to X-ray diffraction data, samples of CaCu3Ti4-4хFe4хO12-δ and CaCu3-3хFe3хTi4O12+δ composition do not contain iron-containing impurity phases; in trace amounts may contain copper oxide (II). According to thermogravimetry data, no weight loss of samples was recorded before the melting start temperature (~1033 °C). The DSC curves of doped calcium-copper titanate samples show an exothermic effect in the range of 506–573 K, not associated with a phase transition, and an endothermic process, at a temperature above 1219 K, due to the dissociation of CuO. The thermal expansion coefficient for CaCu3Ti3,76Fe0.24O12-δ in the range of 298–1193 K changes continuously from 8.6 × 106 (298 К) to 11.4 × 106 °С−1 (1173 К). Based on the results of impedance spectroscopy, the electrical properties of the samples were simulated and an equivalent scheme was proposed. The samples exhibit ionic conductivity. The activation energy of conduction of the CaCu3Ti3.76Fe0.24O12-δ is 0.65 eV and 1.04 eV of the CaCu3-3хFe3хTi4O12+δ.
KW - Calcium-copper titanate
KW - Electrical properties
KW - High-temperature X-ray diffraction
KW - Iron
KW - Thermal expansion
KW - THIN-FILMS
KW - RELAXATION
KW - CONSTANT
KW - CRYSTAL
KW - RESPONSES
KW - TENSOR
KW - ORIGIN
KW - DIELECTRIC-PROPERTIES
KW - PURE
UR - http://www.scopus.com/inward/record.url?scp=85094957358&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2020.123996
DO - 10.1016/j.matchemphys.2020.123996
M3 - Article
AN - SCOPUS:85094957358
VL - 258
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
SN - 0254-0584
M1 - 123996
ER -
ID: 70836779