Pyroelectric characteristics of modified barium titanate ceramics

1992 ◽  
Vol 7 (12) ◽  
pp. 3296-3305 ◽  
Author(s):  
K.K. Deb ◽  
M.D. Hill ◽  
J.F. Kelly
Keyword(s):  
Barium Titanate ◽  
Figure Of Merit ◽  
Transverse Mode ◽  
Pyroelectric Coefficient ◽  
Barium Zirconate ◽  
Charge Coupled Device ◽  
High Figure ◽  
Titanate Ceramics ◽  
Ccd Arrays ◽  
Very High

BaZrO3 and BaHfO3 modified polycrystalline BaTiO3 are candidate materials for transverse mode and pyroelectric charge coupled device (CCD) arrays. Addition of 3–4% barium zirconate and barium hafnate to barium titanate alters the temperature of phase transformations and with it, dielectric and pyroelectric properties. These additions create a temperature range close to room temperature where the pyroelectric coefficient is extremely high relative to the dielectric permittivity. These materials show a very high figure of merit for dielectric bolometer applications that is competitive with existing materials, while being relatively easy to prepare.

Influence of Grain-Growth Inhibiting Dopants on the Electrophysical Properties of Rhombohedral Pyroelectric Lead Zirconate-Titanate Ceramics

1991 ◽  
Vol 243 ◽  
Author(s):  
Jean-Paul Hahn ◽  
Gernot Kostorz
Keyword(s):  
Lead Zirconate Titanate ◽  
Figure Of Merit ◽  
Sintered Density ◽  
Lead Zirconate ◽  
Pyroelectric Coefficient ◽  
Low Dielectric Constant ◽  
Electrophysical Properties ◽  
Low Dielectric ◽  
High Figure ◽  
Titanate Ceramics

AbstractThe aim of this work was to develop a ceramic material exhibiting a large pyroelectric coefficient p = -dP/dT (P = polarization, T = temperature) and a low dielectric constant ∈ in order to obtain a high figure of merit F = p/∈pCp for applications in infrared temperature sensing (p denotes the sintered density of the ceramic, cp the specific heat). The influence of the dopants is paramount, and it was only possible to investigate a few promising ones. Best results were obtained for PZT 60/40 (Zr:Ti=60:40) doped with 2 mol% MnO2. The effects of various dopants and some aging results for PZT 60/40 with MnO2 are presented.

Novel Doping Mechanism for Very-High-Permittivity Barium Titanate Ceramics

2005 ◽  
Vol 81 (7) ◽  
pp. 1957-1960 ◽  
Author(s):  
Finlay D. Morrison ◽  
Derek C. Sinclair ◽  
Janet M. S. Skakle ◽  
Anthony R. West
Keyword(s):  
Barium Titanate ◽  
High Permittivity ◽  
Doping Mechanism ◽  
Titanate Ceramics ◽  
Very High

Dielectric and Pyroelectric Characteristics of Plzt (9.5/65/35) Relaxor Thin Films

1995 ◽  
Vol 403 ◽  
Author(s):  
K. K. Deb
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Figure Of Merit ◽  
Ferroelectric Ceramic ◽  
Pyroelectric Coefficient ◽  
Ir Detector ◽  
Lanthanum Aluminate ◽  
Lower Dielectric Constant ◽  
High Figure ◽  
Detector Materials

AbstractFerroelectric relaxor thin films of lead lanthanide zirconate titanate (PLZT) (9.5/ 65/35) have been deposited by the laser ablation technique onto metallized silicon and lanthanum aluminate substrates. The dielectric and pyroelectric properties of PLZT films and their temperature dependencies have been investigated in some detail in an evaluation of their potential as prospective pyroelectric infrared (IR) detector materials. The temperature at which the dielectric constant of a PLZT film reaches its peak is different from that for the peak pyroelectric coefficient. A lower dielectric constant at which the pyroelectric peak appears contributes to a high figure of merit for PLZT films, so that it is competitive with its ceramic counterpart, as well as with Pb(Mg1/3Nb2/3)O3 (PMN) relaxor ferroelectric ceramic.

scholarly journals A Wideband Low-Profile Tightly Coupled Antenna Array With a Very High Figure of Merit

2019 ◽  
Vol 67 (4) ◽  
pp. 2332-2343 ◽  
Author(s):  
Alpha O. Bah ◽  
Pei-Yuan Qin ◽  
Richard W. Ziolkowski ◽  
Y. Jay Guo ◽  
Trevor S. Bird
Keyword(s):  
Antenna Array ◽  
Figure Of Merit ◽  
Low Profile ◽  
Tightly Coupled ◽  
High Figure ◽  
Very High

Dispersion-free (de)mux with very high figure-of-merit

2003 ◽  
Author(s):  
C.X. Yu ◽  
D.T. Neilson ◽  
C.R. Doerr ◽  
M. Zirngibl
Keyword(s):  
Figure Of Merit ◽  
High Figure ◽  
Very High

scholarly journals Dependence of the dielectric properties of barium titanate ceramics and a composite based on it on the sintering temperature

2021 ◽  
Vol 24 (1) ◽  
pp. 40-47
Author(s):  
O. V. Malyshkina ◽  
A. I. Ivanova ◽  
Gr. S. Shishkov ◽  
A. A. Martyanov
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Barium Titanate ◽  
Barium Ferrite ◽  
Sintering Temperature ◽  
Pyroelectric Coefficient ◽  
Ceramic Samples ◽  
Barium Titanate Ceramic ◽  
Titanate Ceramics ◽  
Composite Samples

In this paper, we compare the structure and dielectric properties of the samples of barium titanate ceramics that have been sintered at temperatures of 1100, 1150, 1200, 1250 and 1350 °C and dielectric characteristics of the samples of barium titanate (80 vol.%) — barium ferrite (20 vol.%). It is shown that only samples sintered at the temperature of 1250 and 1350 °C have polarization sufficient for the existence of the piezoelectric effect. For the same samples, the pyroelectric coefficient and reversal polarization significantly exceed those for samples sintered at lower temperatures. Analysis of the samples structure confirmed the dependence of the dielectric properties of the barium titanate ceramics on the grain size and, as a consequence, on the sintering temperature. Based on the studies carried out, the optimal temperature (1250 °С) for obtaining composite samples of barium titanate (80 vol.%) — barium ferrite (20 vol.%) was selected. The temperature dependence of the dielectric constant for the composite samples based on barium ferrite — barium titanate with a sintering temperature of 1250 °C is similar to the dependence for the BaTiO3 ceramic samples sintered at 1350 °C. At room temperatures, the permittivity of the composite samples is also significantly higher than that of the barium titanate ceramic samples obtained at the same sintering temperatures. The addition of barium ferrite to the barium titanate not only increased the permittivity of the composite, but also led to a diffusing of the ferroelectric phase transition and a shift in the temperature of the maximum of the dielectric constant by 10 degrees towards high temperatures.

scholarly journals Effect of sintering temperature on dielectric properties of barium titanate ceramics and composite

2020 ◽  
Vol 6 (4) ◽  
pp. 141-146
Author(s):  
Olga V. Malyshkina ◽  
Gregory S. Shishkov ◽  
Andrey A. Martyanov ◽  
Alexandra I. Ivanova
Keyword(s):  
Dielectric Properties ◽  
Barium Titanate ◽  
Barium Ferrite ◽  
Room Temperature ◽  
Sintering Temperature ◽  
Pyroelectric Coefficient ◽  
Maximum Temperature ◽  
And Shifts ◽  
Titanate Ceramics ◽  
Composite Samples

The structure and dielectric properties of barium titanate ceramics samples sintered at 1100, 1150, 1200, 1250 and 1350 °C have been compared with the dielectric properties of 80 vol.% barium titanate + 20 vol.% barium ferrite composite samples sintered at 1150, 1200 and 1250 °C. It has been shown that polarization sufficient for existence of the piezoelectric effect is only achieved in barium titanate samples sintered at 1250 and 1350 °C. Furthermore the pyroelectric coefficient and reversal polarization of these samples are far higher than those of samples sintered at lower temperatures. Analysis of the sample structures has confirmed that the dielectric properties of barium titanate ceramics depend on grain size and therefore on sintering temperature. Based on the experimental results we have selected the optimum sintering temperature for 80 vol.% barium titanate + 20 vol.% barium ferrite composite to be 1250 °С. Further increase in sintering temperature to 1300 °C showed that this composite has a eutectic. The temperature dependence of the permittivity of the barium titanate / barium ferrite composite sintered at 1250 °С is similar to that of BaTiO3 ceramics samples sintered at 1350 °С. The room temperature permittivity of the composite samples also proves to be far higher than that of barium titanate ceramics samples sintered at the same temperatures. Barium ferrite addition to barium titanate increases the permittivity of the composite and also diffuses the ferroelectric phase transition and shifts the permittivity maximum temperature by 10 °C towards higher temperatures.

La2/3 Sr1/3 VO3 Thin Films: A New p-Type Transparent Conducting Oxide with Very High Figure of Merit

2018 ◽  
Vol 4 (3) ◽  
pp. 1700476 ◽  
Author(s):  
Ling Hu ◽  
Renhuai Wei ◽  
Jian Yan ◽  
Dong Wang ◽  
Xianwu Tang ◽  
...  
Keyword(s):  
Thin Films ◽  
Figure Of Merit ◽  
Transparent Conducting Oxide ◽  
Transparent Conducting ◽  
High Figure ◽  
P Type ◽  
Very High
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