Structural and electrical properties of Cu-doped (K0.5Na0.5)NbO3-MgTiO3 lead-free ceramics

2009 ◽  
Vol 479 (1-2) ◽  
pp. L18-L21 ◽  
Author(s):  
Meng Jiang ◽  
Xuhai Li ◽  
Jing Liu ◽  
Jiliang Zhu ◽  
Xiaohong Zhu ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Lead Free ◽  
Lead Free Ceramics ◽  
Structural And Electrical Properties

scholarly journals Microstructural and Electrical Properties of Sn-Modified BaTiO3 Lead-Free Ceramics by Two-Step Sintering Method

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Wichita Kayaphan ◽  
Pornsuda Bomlai
Keyword(s):  
Electrical Properties ◽  
Curie Temperature ◽  
Dwell Time ◽  
Sintering Temperature ◽  
Perovskite Phase ◽  
Lead Free ◽  
Tetragonal Symmetry ◽  
Lead Free Ceramics ◽  
Pure Perovskite Phase ◽  
Structural And Electrical Properties

Ba(Ti0.92Sn0.08)O3 lead-free ceramics were prepared using a two-step sintering (TSS) technique. Varying the first sintering temperature T1 (1400 and 1500°C) and the dwell time t1 (0, 15, and 30 min), we obtained dense ceramics which were then soaked at a constant temperature of 1000°C (T2) for 6 h (t2). The structural and electrical properties were investigated. XRD results indicated that all the ceramics showed a pure perovskite phase with tetragonal symmetry. Density and grain size increased with higher T1 temperatures and increased t1 dwell times. Enhanced electrical properties were achieved by sintering at the optimized T1 sintering temperature and t1 dwelling time. At the lower T1 sintering temperature of 1400°C, the dielectric and piezoelectric properties and the Curie temperature of the ceramics were improved significantly by increasing t1 dwell time. Further, increasing the sintering temperature T1 to 1500°C, excellent properties were obtained at t1 = 15 min which then deteriorated when t1 was increased to 30 min. The electrical properties of the sample sintered under the T1/t1/T2/t2 condition of “1500/15/1000/6” showed the best values. For this sample the piezoelectric coefficient (d33), dielectric permittivity (εr), loss factor (tanδ), and Curie temperature (TC) were 490 pC/N, 4385, 0.0272, and 48°C, respectively.

(1 − x)(K0.48Na0.52)(Nb0.95−y−zTazSby)O3–xBi0.5(Na0.82K0.18)0.5ZrO3 lead-free ceramics: composition dependence of the phase boundaries and electrical properties

2015 ◽  
Vol 44 (10) ◽  
pp. 4440-4448 ◽  
Author(s):  
Xiang Lv ◽  
Jiagang Wu ◽  
Dingquan Xiao ◽  
Hong Tao ◽  
Yuan Yuan ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Composition Dependence ◽  
Lead Free ◽  
Phase Boundaries ◽  
Phase Structures ◽  
Lead Free Ceramics

In this work, the KNNST-BNKZ-xyz ceramics were obtained, and the composition dependence of their phase structures and electrical properties was discussed.

Microstructures, phase evolution and electrical properties of (1-x)K0.40Na0.60Nb0.96Sb0.04O3-xBi0.5K0.5HfO3 lead-free ceramics

2019 ◽  
Vol 45 (5) ◽  
pp. 6328-6334 ◽  
Author(s):  
Yunyi Liu ◽  
Yunhe Yi ◽  
Yungang Yu ◽  
Yongqi Pan ◽  
Caiwang He ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Phase Evolution ◽  
Lead Free ◽  
Lead Free Ceramics

Effect of Bi2O3 Addition on the Microstructure and Electrical Properties of Lead-Free (Na0.5K0.5)NbO3-Bi0.5(Na0.93K0.07)0.5TiO3 Ceramics

2013 ◽  
Vol 479-480 ◽  
pp. 3-7
Author(s):  
Chun Huy Wang
Keyword(s):  
Solid Solution ◽  
Electrical Properties ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Lead Free ◽  
Coupling Coefficients ◽  
Electromechanical Transducer ◽  
Lead Free Ceramics ◽  
Thickness Mode ◽  
Planar Mode

In the present study, various quantities of Bi2O3were added into 0.98(Na0.5K0.5)NbO3-0.02Bi(Na0.93K0.07)TiO3(0.98NKN-0.02BNKT) ceramics. It was found that 0.98NKN-0.02BNKTwith the addition of 0~0.5 wt.% Bi2O3exhibit relatively good piezoelectric properties. For 0.98NKN-0.02BNKT ceramics, the electromechanical coupling coefficients of the planar modekpand the thickness modektreach 0.40 and 0.47,respectively. For 0.98NKN-0.02BNKT ceramics with the addition of 0.3 wt.% Bi2O3, the electromechanical coupling coefficients ofthe planar modekpand the thickness modektreach 0.50 and 0.53, respectively. It is obvious that 0.98NKN-0.02BNKT solid solution ceramics by adding low quantities of Bi2O3is one of the promising lead-free ceramics for electromechanical transducer applications.

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