期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 182, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2023.111579
关键词
Dielectric property; Ab initi o calculations; Loss tangent; Dielectric permittivity
The dielectric response of a novel giant dielectric ceramic, Na1/3Ca1/3La1/3Cu3Ti4O12, with good dielectric and electrical properties was investigated. This perovskite-like ceramic was synthesized using a sol-gel method and exhibited large dielectric permittivities and low dielectric loss tangent values. Na+ substituted the Cu2+ sites, while La3+ likely occupied Ca2+ sites. The presence of an oxygen vacancy in the lattice resulted in generation of Cu+ and Ti3+, which caused the giant dielectric behavior of these materials through the IBLC phenomenon and small polaron hopping.
The dielectric response of a novel giant dielectric ceramic with good dielectric and electrical properties, Na1/ 3Ca1/3La1/3Cu3Ti4O12, was investigated in this work. This ceramic, with a perovskite-like structure, was successfully synthesized using a sol-gel method. Fine-grain ceramics were found in all sintered specimens. These ceramics produced large dielectric permittivities, 9.89 x 103-1.04 x 104, and low dielectric loss tangent values of 0.040-0.057. First-principles calculations indicated that Na+ is substituted at the Cu2+ sites. Additionally, La3+ likely occupies Ca2+ sites. Experimental and computational techniques demonstrated the presence of an oxygen vacancy in the Na1/3Ca1/3La1/3Cu3Ti4O12 lattice that results in generation of Cu+ and Ti3+. The IBLC phenomenon and small polaron hopping between valence electrons of Cu and Ti ions have been recognized as the causes of the giant dielectric behavior of these materials.
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