期刊
CERAMICS INTERNATIONAL
卷 41, 期 10, 页码 13389-13392出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.07.127
关键词
Optical properties; Ferroelectric ceramics; Lattice expansion; Oxygen vacancies
资金
- National Natural Science Foundation of China [61474045]
- State Key Basic Research Program of China [2013CB922300]
Band-gap narrowing effects have been observed in and Ni-doped PbTiO3 and Ni-doped Ba(Ti0.875Ce0.125)O-3 ferroelectric ceramics. Structural characterizations and microstructural analysis show that the as-prepared PbTi0.67Ni0.33O3-delta (PTN) and Ba(Ti0.75Ce0.125Ni0.125)O3-delta (BTCN) samples exhibit polycrystalline perovskite structures with dense microstructures. The Ni doping at Ti-site results in lattice expansion and introduces oxygen vacancies. Note that the band-gap values of PTN and BTCN are 2.42 eV and 2.73 eV, respectively, much smaller than that of corresponding parent PbTiO3 (3.21 eV) and BaTiO3 (3.37 eV) materials. This optical behavior can be due to new states of both the highest occupied molecular orbital and the lowest unoccupied molecular orbital in an electronic structure with the presence of Ni. With such decreased optical band-gaps, the PTN and BTCN materials will have great potential in solar-energy conversion devices. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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