Fabrication and Characterization of Some Physical Properties of PZTPMnNPSbN Ceramics Doped with ZnO

The effect of the ZnO addition in pure perovskite PZT-PMnN-PSbN ceramics sintered from 950 to 1200oC has been investigated. The phase structure of ceramics changes from rhombohedral to tetragonal and the temperature decreases with the increase of the ZnO content. The limitation of Zn2+ concentration for the solubility in PZT–PMnN–PSbN systems is about 0.25% wt., at which the ceramic shows some good physical properties such as the density of 8.20 g/cm3, some dielectric constants including εr = 1,555 and εmax = 32,900. The highest value of εmax about 22,000 was found at 1 kHz at the temperature of Tm around 575 K. Using an extended Curie-Weiss law the diffuse phase transition was determined. Cole-Cole analyses showed the non-Debye type relaxation in the system

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Effect of A-site vacancy order-disorder states on diffuse phase transition of the morphotropic phase boundary Pb1−xBaxNb2O6 ferroelectrics

Journal of Materials Research ◽

10.1557/jmr.1996.0293 ◽

1996 ◽

Vol 11 (9) ◽

pp. 2302-2308 ◽

Cited By ~ 14

Author(s):

Xiaoyue Xiao ◽

Yan Xu ◽

Zhigang Zeng ◽

Zhilun Gui ◽

Longtu Li ◽

...

Keyword(s):

Phase Transition ◽

Phase Boundary ◽

Morphotropic Phase Boundary ◽

Diffuse Phase Transition ◽

Frequency Dispersion ◽

Dielectric Constants ◽

A Site ◽

Curie Temperatures ◽

Site Vacancy ◽

Diffuse Phase

The effect of A-site vacancy order-disorder states on diffuse phase transition (DPT) of tungsten bronze Pb1−xBaxNb2O6 (PBN) ferroelectrics has been investigated. The A-site vacancy disordered PBN ceramics exhibit notable variations of the Curie temperatures (i.e., the temperatures at the dielectric maximum permittivities) up to 12 °C in response to frequency changed from 0.1 KHz to 100 KHz. The largest frequency dispersion occurred at the morphotropic phase boundary of 1 − X = 0.63, along with the lowest Curie point. In contrast, the A-site vacancy ordered PBN ceramics present little frequency dispersion in the range of 2 °C from 0.1 KHz to 100 KHz. Dielectric constants of the disordered PBN ceramics were generally higher than those of the ordered ones. In comparison with the ordered PBN ceramics, the Curie points of the disordered ceramics were shifted from lower to higher temperature as the Pb2+ cation percentage was decreased; i.e., the Curie temperatures of the disordered PBN ceramics were lower than those of the ordered ones when 1 − X ≥ 0.70, but higher when 1 − X ≤ 0.65. These differences are suggested to inherently result from the A-site vacancy order-disorder states. The relationship between the A-site vacancy order-disorder states and the dielectric properties has also been confirmed with studies of thermal hysteresis.

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Application of the FITSC method for characterization of PZT-type ceramics with the diffuse phase transition

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2011.03.093 ◽

2011 ◽

Vol 509 (22) ◽

pp. 6452-6456 ◽

Cited By ~ 5

Author(s):

M. Adamczyk ◽

L. Kozielski ◽

A. Lisińska-Czekaj ◽

D. Czekaj

Keyword(s):

Phase Transition ◽

Diffuse Phase Transition ◽

Diffuse Phase

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Thermal physical properties of ferroelectric ceramics PKR-7M near the diffuse phase transition

Physics of the Solid State ◽

10.1134/s106378341107016x ◽

2011 ◽

Vol 53 (7) ◽

pp. 1378-1382 ◽

Cited By ~ 2

Author(s):

S. N. Kallaev ◽

Z. M. Omarov ◽

R. G. Mitarov ◽

S. A. Sadykov

Keyword(s):

Phase Transition ◽

Physical Properties ◽

Diffuse Phase Transition ◽

Ferroelectric Ceramics ◽

Thermal Physical Properties ◽

Diffuse Phase

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Microstructure and Dielectric Properties of Ni2+-Doped (Ba,Sr)TiO3 Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.148-149.1383 ◽

2010 ◽

Vol 148-149 ◽

pp. 1383-1389

Author(s):

Yuan Liang Li ◽

Yuan Fang Qu ◽

Qing Jun Zhang ◽

Ran Ran Wang

Keyword(s):

Phase Transition ◽

Dielectric Properties ◽

Diffuse Phase Transition ◽

Oxygen Vacancies ◽

Doping Concentration ◽

Dissipation Factor ◽

Dielectric Constants ◽

Solid Reaction ◽

Abo3 Perovskite ◽

Diffuse Phase

Ba0.62Sr0.38TiO3 ceramics of perovskite structure are prepared by solid reaction method with the addition of x wt% NiO and their dielectric properties are investigated. It is found that Ni2+ can enter the B site in ABO3 perovskite when doping concentration is less than 0.6 wt%, whereafter, Ni2+ ions most segregates on the grain boundaries to inhabit the grain growth. Due to the decrease of grain size and the impurity, the dielectric constants are decreased. Decrease of dissipation factor is attributed to appearance of the oxygen vacancy and disappearance of the reduction of Ti4+ ion. It is concluded that the diffuse phase transition is linked to the adulteration of Ni2+. The disordering, mechanical stress in the grain and the oxygen vacancies are produced because of the adulteration of Ni2+, and the diffuse phase transition increases with the level of doping increasing, leading to that the peaks of dielectric constants becomes slower and flatter.

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