scholarly journals New Lead-free (1−x)BaTiO3-xBi(Mg1/2Zr1/2)O3Solid Solution with Morphotropic Phase Boundary and Diffuse Phase Transition

2016 ◽  
Vol 99 (11) ◽  
pp. 3651-3658 ◽  
Author(s):  
Shashwat Anand ◽  
Rishikesh Pandey ◽  
Uma Shankar ◽  
Akhilesh Kumar Singh
Keyword(s):  
Phase Transition ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Diffuse Phase Transition ◽  
Lead Free ◽  
Diffuse Phase

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

1996 ◽  
Vol 11 (9) ◽  
pp. 2302-2308 ◽  
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.

Diffuse Phase Transition and Dielectric Properties of Lead-Free Zr-Doped BCTS Ceramics

2017 ◽  
Vol 866 ◽  
pp. 259-262 ◽  
Author(s):  
Puripat Kantha ◽  
Kamonpan Pengpat ◽  
Nuttapon Pisitpipathsin
Keyword(s):  
Phase Transition ◽  
Dielectric Constant ◽  
Diffuse Phase Transition ◽  
Solid State Reaction Method ◽  
Lead Free ◽  
Phase Transition Behavior ◽  
Conventional Solid State Reaction ◽  
Maximum Dielectric Constant ◽  
Cubic Structure ◽  
Diffuse Phase

Lead-free Ba0.9Ca0.1Sn0.06Ti0.94-xZrxO3 (BCTSZ) ceramics where x = 0.00, 0.03, 0.05, 0.07 and 0.09 were prepared by the conventional solid-state reaction method. The dielectric constant of the Zr doped BCTS ceramic was enhanced by Zr incorporation. The maximum dielectric constant were obtained at the composition of x = 0.05. The dielectric property investigation indicated that the degree of the diffuse phase transition behavior increased with Zr substitution. Phase transition of tetragonal to cubic structure was significantly dependent on the amount of Zr added.

Lead-free (Ba,Ca)(Zr,Ti)O3 Based Electrocaloric Devices: Challenges and Perspectives

2013 ◽  
Vol 1581 ◽  
Author(s):  
Gunnar Suchaneck ◽  
Gerald Gerlach
Keyword(s):  
Thin Films ◽  
Phase Transition ◽  
Electric Fields ◽  
Diffuse Phase Transition ◽  
Lead Free ◽  
Large Temperature ◽  
Temperature Changes ◽  
Diffuse Phase

ABSTRACTIn this work, we analyze the requirement to (Ba,Ca)(Zr,Ti)O3 thin films for applications in electrocaloric devices. We demonstrate that large temperature changes are realized mostly independent of the used material by applying sufficient electric fields. Ferroelectrics exhibiting a diffuse phase transition are beneficial for electrocaloric applications, but they change the range of operational temperatures.

New, Lead Free Materials with a Diffuse Phase Transition: NaNbO 3 -Based Solid Solutions

2002 ◽  
Vol 47 (1) ◽  
pp. 277-283 ◽  
Author(s):  
I. P. Raevski ◽  
S. A. Prosandeev ◽  
L. Jastrabik
Keyword(s):  
Phase Transition ◽  
Solid Solutions ◽  
Diffuse Phase Transition ◽  
Lead Free ◽  
Diffuse Phase
Sign in / Sign up

Export Citation Format

Share Document