(K0.5Na0.5)NbO3-(Ca0.5Sm0.5)(Mg0.5Nb0.5)O3铁电陶瓷的光致介电响应与光致发光

doi:10.11896/cldb.23040126

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Abstract The change of the dielectric constant under illumination can be used to develop new-type light-controlled devices. (1-x)(K_0.5Na_0.5)NbO₃-x(Ca_0.5Sm_0.5)(Mg_0.5Nb_0.5)O₃(KNN-xCSMN, 0.02≤x ≤0.06) ceramics with different molar ratios were prepared by traditional solid-phase sintering method, and the structure and photoelectric response behavior were studied. When CSMN is introduced, the phase structure of ceramics changes from the orthogonal phase to the pseudo-cubic phase, and the grain size decreases significantly. An obvious photodielectric response is observed under the illumination of 365 nm light, and the dielectric tunability is up to about 249% at x=0.03 and a test frequency of 80 Hz. The increase in diffusion coefficient from 1.43 to 1.82 enhances the relaxation behavior of the ceramics, and the band gap decreases from 3.00 eV to 2.36 eV. A strong orange-red light is emitted under the illumination of 406 nm light. Meanwhile, the capacitance shows reversible switching characteristics at light-on and light-off states, and the switching ratio of capacitance at on/off states is about 3.5. These results will help to explore new noncontact devices, such as phototunable capacitive sensors and optical switches.

Key words： (K_0.5Na_0.5)NbO₃ photodielectric response tunability photoluminescence

Published: Online: 2024-10-12

CLC number:

TQ174

Fund:This work was financially supported by the National Natural Science Foundation of China (52062007) and the Guangxi Natural Science Foundation (2021GXNSFAA220020).

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	LUO Wenliu
	YANG Ling
	YE Mao
	OU Yanghong
	XU Jiwen
	TANG Na

Cite this article:

LUO Wenliu,YANG Ling,YE Mao, et al. Photodielectric Response and Photoluminescence of (K_0.5Na_0.5)NbO₃-(Ca_0.5Sm_0.5)- (Mg_0.5Nb_0.5)O₃ Ferroelectric Ceramics[J]. Materials Reports, 2024, 38(18): 23040126-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23040126 OR http://www.mater-rep.com/EN/Y2024/V38/I18/23040126

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