Electrical properties and 18O tracer diffusion in (Bi0.5Na0.5)TiO3 ceramics doped with CuO and Nb2O5
Source abstract
Abstract
Bi0.5Na0.5)TiO3[BNT] ceramics can be sintered at low temperatures of 940 with CuO addition.This is believed to reduce Bi 3+ volatilization and improve the quality of BNT-based ceramics by lowering the number of oxygen vacancies.However, there is no direct evidence that low-temperature sintering prevents the formation of oxygen vacancies.In this study, the formation of oxygen vacancies by 18 O tracer diffusion and the additive effect of CuO on this formation in BNT ceramics were examined using secondary ion mass spectrometry (SIMS).In addition, Nb2O5, which acts as a donor, was added to the CuO-doped BNT ceramics.The formation of oxygen vacancies was discussed, and the electrical properties were clarified.As a result, the volume diffusion coefficients D of the BNT ceramics with 0.5 wt% CuO (Cu0.5) were 2.010 -11 cm 2 /s.This value is equivalent to pure BNT, which means that for BNT ceramics, CuO acts as an acceptor, suggesting that BNT ceramics still contain many oxygen vacancies.On the other hand, the D of 18 O in Cu0.5 added 0.4 wt% Nb2O5 was 3.510 -15 cm 2 /s, indicating that the formation of oxygen vacancies is suppressed.Moreover, Nb2O5 enhanced the poling treatment and the coercive field Ec decreased, indicating a softening trend.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Transition Metal Oxide Nanomaterials · Gas Sensing Nanomaterials and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Tokyo University of Science
National Institute for Materials Science
References (57)
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