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Photoluminescence and Temperature Dependent Electrical Properties of Er‐Doped 0.94 Bi 0.5 Na 0.5 TiO 3 ‐0.06 BaTiO 3 Ceramics
Author(s) -
Hu Bin,
Pan Zhao,
Dai Ming,
Guo FeiFei,
Ning Huanpo,
Gu ZhengBin,
Chen Jun,
Lu MingHui,
Zhang ShanTao,
Yang Bin,
Cao Wenwu
Publication year - 2014
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.13217
Subject(s) - photoluminescence , ferroelectricity , materials science , dielectric , doping , electric field , analytical chemistry (journal) , piezoelectricity , piezoelectric coefficient , poling , polarization (electrochemistry) , mineralogy , optoelectronics , composite material , chemistry , physics , chromatography , quantum mechanics
Er‐doped 0.94 Bi 0.5 Na 0.5 TiO 3 ‐0.06 BaTiO 3 ( BNT ‐6 BT : x Er , x is the molar ratio of Er 3+ doping) lead‐free piezoceramics with x = 0–0.02 were prepared and their multifunctional properties have been comprehensively investigated. Our results show that Er ‐doping has significant effects on morphology of grain, photoluminescence, dielectric, and ferroelectric properties of the ceramics. At room temperature, the green (550 nm) and red (670 nm) emissions are enhanced by Er ‐doping, reaching the strongest emission intensity when x = 0.0075. The complex and composition‐dependent effects of electric poling on photoluminescence also have been measured. As for electrical properties, on the one hand, Er ‐doping tends to flatten the dielectric constant‐temperature (ε r ‐ T ) curves, leading to temperature‐insensitive dielectric constant in a wide temperature range (50°C–300°C). On the other hand, Er ‐doping significantly decreases the ferroelectric‐relaxor transition temperature ( T F–R ) and depolarization temperature ( T d ), with the T F–R decreasing from 76°C to 42°C for x = 0–0.02. As a result, significant composition‐dependent electrical features were found in ferroelectric and piezoelectric properties at room temperature. In general, piezoelectric and ferroelectric properties tend to become weaker, as confirmed by the composition‐dependent piezoelectric coefficient ( d 33 ), planar coupling factor ( k p ), and the shape of polarization‐electric field ( P – E ), current‐electric field ( J–E ), bipolar/unipolar strain‐electric field ( S–E ) curves. Furthermore, to understand the relationship between the T F–R / T d and the electrical properties, the composition of x = 0.0075 has been intensively studied. Our results indicate that the BNT ‐6 BT : x Er with appropriate Er ‐doping may be a promising multifunctional material with integrated photoluminescence and electrical properties for practical applications.