Ceramics and glass Effect of excess Bi2O3 content on the sintering and dielectric characteristics of 0.65 (K0.5Bi0.5TiO3)-0.35 BaTiO3 ceramic

2015 ◽  
pp. 97-102
Keyword(s):  
Batio3 Ceramic ◽  
Dielectric Characteristics ◽  
Bi2o3 Content

Influence of Excess Bi2O3 on the Characteristics of (Na0.5Bi0.5)TiO3-BaTiO3 Ceramics

2008 ◽  
Vol 368-372 ◽  
pp. 65-68 ◽  
Author(s):  
Yin Fang Wei ◽  
Chia Hsiung Kao ◽  
Cheng Fu Yang ◽  
Ho Hua Chung ◽  
Hong Hsin Huang ◽  
...  
Keyword(s):  
Piezoelectric Materials ◽  
Dielectric Constants ◽  
Sintering Process ◽  
Dielectric Characteristics ◽  
Temperature Range ◽  
Measured Frequency ◽  
Sintering Characteristics ◽  
Xrd Patterns ◽  
Curie Temperatures ◽  
Bi2o3 Content

In this study, piezoelectric materials 0.95 (Na0.5Bi0.5)TiO3-0.05 BaTiO3 (NBT-BT) composition with excess x wt% Bi2O3 (x=0, 1, 2, and 3) are investigated as a function of sintering temperatures. The sintering characteristics and dielectric characteristics of excess Bi2O3-doped 0.95 (Na0.5Bi0.5)TiO3- 0.05 BaTiO3 ceramics are developed with the aid of SEM, XRD patterns, and dielectric-temperature curves. The sintering process is carried out in air for 2h from 1120oC to 1200oC. Dielectric-temperature properties are investigated in the temperature range of 30oC~350oC at the frequencies of 10KHz~1MHz. The maximum dielectric constants of NBT-BT ceramics first increase with the increase of Bi2O3 content, reach the maximum at 1wt%- Bi2O3-added NBT-BT ceramics, and then decrease with the further increase of Bi2O3 content. The maximum dielectric constants of NBT-BT ceramics are almost unchanged as the measured frequency increases. The Curie temperatures of NBT-BT ceramics are also developed.

Sintering and Dielectric Properties of Excess Bi2O3 Doped BaBi2Nb2O9 Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 188-191 ◽  
Author(s):  
Ho Hua Chung ◽  
Cheng Fu Yang ◽  
Yi Chang Chung ◽  
Cheng Yuan Kung
Keyword(s):  
Dielectric Properties ◽  
Sintering Temperature ◽  
Ferroelectric Materials ◽  
Dielectric Constants ◽  
X Ray Diffraction ◽  
Dielectric Characteristics ◽  
X Ray ◽  
Curie Temperatures ◽  
Bi2o3 Content ◽  
Apparent Influence

In this study, ferroelectric materials with Bi-layered structure BaBi2Nb2O9 with excess x wt% Bi2O3 (x=0, 1.5, and 3) are investigated as the main compositions, and the sintering is proceeded from 1000oC~1100oC. The effect of Bi2O3 on the morphologies, crystal structure, and dielectric characteristics of BaBi2Nb2O9 ceramics is developed with the aid of SEM, X-ray diffraction, and dielectric-temperature curves. Dielectric properties are investigated in the temperature of 25oC~ 465oC at frequency 10KHz~1MHz. It is found that sintering temperature and Bi2O3 content has no apparent influence on the Curie temperatures, but they have large influence on the maximum dielectric constants.

The Influence of the Ash Addition from Thermal Power Plant on the Mechanical, Thermal and Dielectric Characteristics of Mortars

2018 ◽  
Vol 69 (8) ◽  
pp. 2040-2044
Author(s):  
Georgeta Velciu ◽  
Virgil Marinescu ◽  
Adriana Moanta ◽  
Ladislau Radermacher ◽  
Adriana Mariana Bors
Keyword(s):  
Thermal Conductivity ◽  
Fly Ash ◽  
Power Plant ◽  
Cement Mortar ◽  
Thermal Power ◽  
Total Content ◽  
Ash Content ◽  
Dielectric Losses ◽  
Dielectric Characteristics ◽  
Cement Mortars

The influence of fly ash adittion (90 % fraction [ 100 mm) on the cement mortar characteristics was studied. The XRD, XRF, SEM and FTIR determinations indicated that fly ash used has a hollow microstructure of microsphere and cenosphere whose total content in SiO2, Al2O3 and Fe2O3 is 88.63 % and that of CaO and MgO of 8.55 %. The mechanical, thermal and dielectric determinations made on mortar samples with content of fly ash in the 0-40 % range have highlighted fact that the mechanical strength of cement mortars is maximal at 20 %, the increase in fly ash content leads to a decrease in relative density and thermal conductivity as well as and to increased dielectric losses tgd.

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