Enhanced ferroelectricity in PLZT ceramic by precise La-doping, minimizing pyrochlore phase and lead loss

Vacuum ◽  
2018 ◽  
Vol 157 ◽  
pp. 514-523 ◽  
Author(s):  
Shibnath Samanta ◽  
V. Sankaranarayanan ◽  
K. Sethupathi ◽  
M.S. Ramachandra Rao
Keyword(s):  
Pyrochlore Phase ◽  
La Doping ◽  
Plzt Ceramic

Effects of Lanthanum Modification on the Structure and Electrical Properties of PZN-PZT Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 227-230 ◽  
Author(s):  
X. Zeng ◽  
Ai Li Ding ◽  
X.S. Zheng ◽  
Yong Zhang ◽  
Ping Sun Qiu
Keyword(s):  
Piezoelectric Properties ◽  
Pyrochlore Phase ◽  
Present System ◽  
Precursor Method ◽  
Pzt Ceramics ◽  
La Doping ◽  
Maximum Decrease ◽  
Columbite Precursor ◽  
Dielectric And Piezoelectric Properties ◽  
Diffuse Phase

La-modified PZN-PZT compositions with representative formula Pb1-0.7xLa0.7x(Zn1/3Nb2/3)0.3- (Zr0.55Ti0.45)0.7(1-x/4)O3 were prepared by the columbite precursor method. La content, x, was varied from 0 to 8mol%. Effects of La doping on microstructure, dielectric and piezoelectric properties were investigated. The results showed that in present system La doping promotes the formation of pyrochlore phase and the phase shifted from rhombohedral to tetragonal structure with increasing La content. It was also found that La doping makes dielectric permittivity maximum decrease and the degree of diffuse phase transition enhance. Appropriate amount of La doping could improve the piezoelectric properties.

Effects of La-Doping on Phase Structure and Electrical Properties of Pb(Mg1/3Nb2/3)0.67Ti0.33O3 Ceramic

2012 ◽  
Vol 622-623 ◽  
pp. 767-770
Author(s):  
Yong Liu ◽  
Rui Qing Chu ◽  
Zhi Jun Xu ◽  
Shu Ting Wang ◽  
Qing Bin Chi ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Phase Structure ◽  
Doping Level ◽  
Raw Materials ◽  
Pyrochlore Phase ◽  
X Ray Diffraction ◽  
La Doping ◽  
Low X ◽  
Sintering Method ◽  
La Doped

La-doped Pb(Mg1/3Nb2/3)0.67Ti0.33O3 ceramics were fabricated by a two-stage sintering method from conventional raw materials. The effects of La doping on the phase structure and electrical properties of ceramics were investigated. X-ray diffraction analysis showed that the pyrochlore phase increased with the increase of La-doping level. The effects of La doping on the dielectric, ferroelectric and piezoelectric properties of the ceramics were also investigated. The results showed that La doping seriously weakened the electrical properties of the ceramics. The ceramics possess optimum properties (d33=239pC/N, Pr=10.6μC/cm2, Ec=8.5kV/cm, tanδ=0.029, εr = 2250) when the doping level is low (x = 0.02).

Evolution of spatial spin-modulated structure with La doping in Bi1-yLayFeO3 multiferroics

2021 ◽  
Vol 517 ◽  
pp. 167341 ◽  
Author(s):  
V.S. Pokatilov ◽  
A.O. Makarova ◽  
A.A. Gippius ◽  
A.V. Tkachev ◽  
S.V. Zhurenko ◽  
...  
Keyword(s):  
Modulated Structure ◽  
La Doping

Distribution of pyrochlore phase in Pb(Mg1/3Nb2/3)O3-PbTiO3 films and suppression with a Pb(Zr0.52Ti0.48)O3 interfacial layer

2012 ◽  
Vol 520 (24) ◽  
pp. 7071-7075 ◽  
Author(s):  
Sun A Yang ◽  
Sam Yeon Cho ◽  
Jong Sun Lim ◽  
Sang Don Bu
Keyword(s):  
Interfacial Layer ◽  
Pyrochlore Phase

Phase Evolution and Dielectric Characterization of Lead Nickel Niobate–lead Zirconate Ceramics Prepared from the Hydrothermally Derived Precursors

1999 ◽  
Vol 14 (4) ◽  
pp. 1364-1370 ◽  
Author(s):  
Chung-Hsin Lu ◽  
Wen-Jeng Hwang
Keyword(s):  
Dielectric Response ◽  
Pyrochlore Phase ◽  
Phase Evolution ◽  
Intermediate Compound ◽  
Lead Zirconate ◽  
Relaxor Ferroelectrics ◽  
Dielectric Characterization ◽  
Lead Nickel ◽  
Rich Side

The perovskite compounds with the composition of (1 – x) Pb(Ni1/3Nb2/3)O3 –xPbZrO3 have been successfully prepared from hydrothermally treated precursors. During calcination, the primary intermediate compound is pyrochlore phase in the Pb(Ni1/3Nb2/3)O3-rich composition, while it is PbZrO3 on the PbZrO3-rich side. On calcination at 800 °C, all precursors convert into perovskite phases. In the formed solid solutions, increasing PbZrO3 content results in a rise in the apparent Curie temperature as well as the maximum dielectric permittivity. The Pb(Ni1/3Nb2/3)O3-rich perovskites (x < 0.8) possess the characteristics of relaxor ferroelectrics. With increasing PbZrO3 content, the dielectric response gradually becomes less diffuse and dispersive, reflecting a reduction in the relaxor characteristics of the formed perovskites.

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