Structure and dielectric properties of (1-x)Bi 0.5 Na 0.5 TiO 3-x BaTiO 3 piezoceramics prepared using hydrothermally synthesized powders
The influence of different processing parameters and various Ba addition (up to 10 mol%) on the structure and dielectric properties of Bi Na TiO -BaTiO (BNT-BT) ceramics was investigated. The powders were hydrothermally synthesized in the alkaline environment at 180°C for different time periods. X-r...
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Published in | Royal Society open science Vol. 8; no. 7; p. 202365 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
England
01.07.2021
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Subjects | |
Online Access | Get full text |
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Summary: | The influence of different processing parameters and various Ba
addition (up to 10 mol%) on the structure and dielectric properties of Bi
Na
TiO
-BaTiO
(BNT-BT) ceramics was investigated. The powders were hydrothermally synthesized in the alkaline environment at 180°C for different time periods. X-ray diffraction confirmed the presence of dominant rhombohedral Bi
Na
TiO
phase and a small amount of secondary pyrochlore Bi
Ti
O
phase in the pure BNT powders. In addition, one-dimensional Na
Ti
O
structure was also observed in the powder hydrothermally treated for a long time (i.e. 48 h). The amount of secondary pyrochlore phase in the BNT-BT powders increases with the increase of Ba
content. The synthesized powders were pressed into pellets and finally sintered at various temperatures up to 1150°C. High density (more than 90%TD) was obtained in all BNT-BT sintered samples. Optimal sintering parameters were chosen in order to obtain dense ceramics with the optimal phase composition. The temperature dependence of dielectric properties for the BNT-BT ceramics was also studied. Relaxor behaviour of BNT-based ceramics and broad transition peaks are evident in all samples. Dielectric constant up to 400 as well as an acceptable low dielectric loss at temperatures lower than 200°C were obtained in BNT-BT ceramics. |
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ISSN: | 2054-5703 2054-5703 |
DOI: | 10.1098/rsos.202365 |