Influence of Yb{sub 2}O{sub 3} on electrical and microstructural characteristics of CaCu{sub 3}Ti{sub 4}O{sub 12} ceramics

Journal Article · Tue Sep 15 04:00:00 EDT 2015 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2014.11.054· OSTI ID:22475875

He, Kai ^[1]; Luo, Yun ^[1]; Yu, Renhong; Qi, Jiapeng ^[2]; Sun, Xiujuan; Yang, Yongtao; Xu, Hongxing ^[1]; Ma, Jing ^[3]; Xu, Dong ^[1]

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1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013 (China)
2. Changzhou Ming Errui Ceramics Co., Ltd., Changzhou 213102 (China)
3. State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 100083 (China)

Graphical abstract: Some Yb atoms entered in the lattice of CCTO substituted the Ca sites, the rest of Yb atoms concentrated at grain boundaries decreased the grain size. The dielectric constant was decreased by Yb doping. The dielectric loss of the CCTO could be greatly reduced at low frequency. - Highlights: • Yb atoms may take the place of Ca sites and concentrate at grain boundaries. • Tiny second phase corresponding to Yb may decrease the grain size. • Decrease of the grain size leads to the decrease of dielectric constant. • Yb doping could decrease the dielectric loss of CCTO. - Abstract: This paper focuses on the remarkable effects of Yb{sub 2}O{sub 3} doping on the microstructure and dielectric characteristics of CaCu{sub 3}Ti{sub 4}O{sub 12} (CCTO). Samples were prepared by the solid phase reaction method and sintered in air at 1030 °C for 12 h. X-ray diffraction and X-ray photoelectron spectroscopy studies confirm that the primary phase is CCTO. Some Yb{sup 3+} ions may substitute into the Ca site at the center or zenith sites of the CCTO lattice hexahedron, while the rest of the Yb atoms may concentrate at grain boundaries. The grain size of Yb{sub 2}O{sub 3}-doped CCTO ceramics were examined by scanning electron microscopy and demonstrate sharp grain size reduction with Yb{sub 2}O{sub 3} doping. From dielectric property measurements, the Yb{sub 2}O{sub 3} doping reduces the dielectric constant of CCTO, and the dielectric loss is also reduced.

• OSTI ID: 22475875
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Vol. 69; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM COMPOUNDS
CERAMICS
COPPER COMPOUNDS
CRYSTAL STRUCTURE
DIELECTRIC MATERIALS
DOPED MATERIALS
ELECTRICAL PROPERTIES
GRAIN BOUNDARIES
GRAIN SIZE
MICROSTRUCTURE
PERMITTIVITY
REDUCTION
SCANNING ELECTRON MICROSCOPY
SOLIDS
TITANATES
X-RAY DIFFRACTION
X-RAY PHOTOELECTRON SPECTROSCOPY
YTTERBIUM OXIDES