scholarly journals OPTIMIZATION OF TECHNOLOGY FOR PRODUCING A COMPOSITE BASED ON BARIUM FERRITE AND BARIUM TITANATE

2021 ◽  
pp. 740-749
Author(s):  
Ольга Витальевна Малышкина ◽  
Григорий Сергеевич Шишков ◽  
Александра Ивановна Иванова
Keyword(s):  
Barium Titanate ◽  
Barium Ferrite ◽  
Pyroelectric Coefficient ◽  
Magnetic Characteristics ◽  
Piezoelectric Modulus ◽  
Barium Titanate Ceramic ◽  
Porcelain Crucible ◽  
Titanate Ceramics ◽  
Composite Samples ◽  
Titanate Ceramic

В работе показано, что в результате спекания образцов композита титанат бария (80 объемных %) - феррит бария (20 объемных %) в фарфоровом тигле при температуре 1300 °С возникает эвтектика. В результате сравнения свойств образцов, полученных при различных температурах спекания, установлено, что оптимальные свойства имеют образцы, спеченные при 1250 °С. Проведено сравнение структуры и диэлектрических свойств образцов керамики титаната бария и композита титанат бария (80 объемных %) - феррит бария (20 объемных %), спеченных при температуре 1250°С. Показано, что добавление в состав титаната бария 20% феррита бария повышает значение диэлектрической проницаемости, пироэлектрического коэффициента и пьезоэлектрического модуля d композита в 1,5 - 2 раза по сравнению с керамикой титаната бария, тогда как значение пьезоэлектрического модуля d остается без изменения. Введение в состав керамики титаната бария 20 % феррита бария достаточно для того, чтобы полученный композит имел магнитные характеристики, соответствующий чистому ферриту бария. It is shown in the work that as a result of sintering of composite samples of barium titanate (80 vol. %) - barium ferrite (20 vol. %) in a porcelain crucible at a temperature of 1300 °C, a eutectic appears. As a result of comparing the properties of the samples obtained at different sintering temperatures, it was found that the samples sintered at 1250 °C have optimal properties. The structure and dielectric properties of barium titanate ceramic samples and barium titanate (80 vol. %) - barium ferrite (20 vol. %) composite sintered at a temperature of 1250 °C are compared. It has been shown that the addition of 20% barium ferrite to the composition of barium titanate increases the dielectric constant, pyroelectric coefficient, and piezoelectric modulus d of the composite of 1,5 - 2 times compared to barium titanate ceramics, while the value of the piezoelectric modulus d remains unchanged. The introduction of 20 % barium ferrite into the barium titanate ceramics is sufficient for the resulting composite to have magnetic characteristics corresponding to pure barium ferrite.

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.

EFFECT OF Co3O4 NANOPARTICLE ON THE PROPERTY OF BARIUM TITANATE CERAMIC

2011 ◽  
Vol 01 (02) ◽  
pp. 229-235 ◽  
Author(s):  
W. C. VITTAYAKORN ◽  
D. BUNJONG ◽  
A. RUANGPHANIT ◽  
N. VITTAYAKORN
Keyword(s):  
Barium Titanate ◽  
Dielectric Behavior ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Cell Parameters ◽  
Fine Grain ◽  
Barium Titanate Ceramic ◽  
Lower Temperature ◽  
Titanate Ceramics ◽  
Titanate Ceramic

Effects of the Co3O4 nanoparticle on the phase formation, microstructure and dielectric properties of barium titanate ceramics are investigated in this study. Co3O4 -doped BaTiO3 ceramics were prepared by the conventional mixed oxide method followed by normal sintering in air. Systematic studies of X-ray diffraction (XRD), scanning electron microscopy and dielectric spectroscopy with varying doping levels were performed. The cell parameters, tetragonality and crystallite size of doped ceramics also were calculated from XRD data. Results showed that the single phase of BaTiO3 gave no evidence of unwanted peak forms in any of the samples. Cubic phase occurred after adding Co3O4 at 0.25 mol%. Various grain sizes and shapes were found in this system. Finally, adding Co3O4 in BaTiO3 ceramics resulted in shifting of the Curie point to a lower temperature. The composition, x = 0.25, showed different dielectric behavior, which related to appearance of the cubic phase and fine grain microstructure.

Pyroelectric Effect in Barium Titanate Ceramic

1969 ◽  
Vol 40 (11) ◽  
pp. 4335-4340 ◽  
Author(s):  
Sidney B. Lang ◽  
Lynn H. Rice ◽  
Steven A. Shaw
Keyword(s):  
Barium Titanate ◽  
Pyroelectric Effect ◽  
Barium Titanate Ceramic ◽  
Titanate Ceramic

Effect of simultaneous substitution of La and Mn on dielectric behavior of barium titanate ceramic

2007 ◽  
Vol 42 (14) ◽  
pp. 5490-5496 ◽  
Author(s):  
Om Parkash ◽  
Devendra Kumar ◽  
R. K. Dwivedi ◽  
K. K. Srivastava ◽  
Prakash Singh ◽  
...  
Keyword(s):  
Barium Titanate ◽  
Dielectric Behavior ◽  
Barium Titanate Ceramic ◽  
Simultaneous Substitution ◽  
Titanate Ceramic

Barium Titanate Ceramic/Ceramic 0–3 Composites for Ultrasonic Transducer Applications

1999 ◽  
Vol 574 ◽  
Author(s):  
M. C. Cheung ◽  
H. L. W. Chan ◽  
Q. F. Zhou ◽  
C. L. Choy
Keyword(s):  
Barium Titanate ◽  
Ceramic Composite ◽  
Ultrasonic Transducer ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Barium Titanate Ceramic ◽  
Sol Gel Process ◽  
Titanate Ceramic

AbstractBarium titanate (BaTiO3) 0–3 ceramic/ceramic composite thick films (∼16μm) for ultrasonic transducer applications were fabricated by a modified sol-gel process. Nano-sized BaTiO3 powder was dispersed in a sol-gel matrix of BaTiO3 to form a 0–3 composite solution. Films were prepared by spin coating and then annealed at various temperatures. The crystallization of the composite film was studied by X-ray diffraction. The dielectric permittivity and the ferroelectric properties of the film were also measured.

Dilatometric behaviour of doped barium titanate ceramic

2013 ◽  
Vol 92 ◽  
pp. 421-423
Author(s):  
Sandeep Mahajan ◽  
Divya Haridas ◽  
O.P. Thakur ◽  
Chandra Prakash
Keyword(s):  
Barium Titanate ◽  
Barium Titanate Ceramic ◽  
Doped Barium Titanate ◽  
Titanate Ceramic
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