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Bond theory, terahertz spectra, and dielectric studies in donor‐acceptor (Nb‐Al) substituted ZnTiNb 2 O 8 system
Author(s) -
Luo Weijia,
Li Lingxia,
Yu Shihui,
Li Jining,
Zhang Bowen,
Qiao Jianli,
Chen Siliang
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16318
Subject(s) - terahertz radiation , dielectric , materials science , acceptor , absorption (acoustics) , attenuation coefficient , absorption spectroscopy , terahertz time domain spectroscopy , dielectric loss , analytical chemistry (journal) , terahertz spectroscopy and technology , phase (matter) , condensed matter physics , optoelectronics , chemistry , optics , physics , composite material , organic chemistry
As a donor and acceptor separately, Nb 5+ and Al 3+ are used to substitute Ti 4+ in the ixiolite ZnTiNb 2 O 8 system for the first time. The dielectric responses in the terahertz range of this system are initially studied based on the data from terahertz time‐domain transmitted spectroscopy. Combined with ligand field theory, the formation of a secondary phase of ZnAl 2 O 4 is reasonably explicated. Then, the origins of the lower dielectric loss and the terahertz wave absorption coefficient are determined to be the high chemical bond covalency and effective phase control. For the composition of ZnTi 0.85 (Al 0.5 Nb 0.5 ) 0.15 Nb 2 O 8 sintered at 1180°C, a low dielectric loss (<5 × 10 −3 @ 0.5 TH z) and absorption coefficient (<10/cm @ 0.5 TH z) are obtained, which make this kind of material propitious for developing terahertz dielectric devices.