Synthesis, structural and dielectric properties of Ca doped PbTiO3 ceramic prepared by hydrothermal method

2021 ◽  
Author(s):  
EL Houcine LAHRAR ◽  
EL Houssine EL GHADRAOUI ◽  
oufae elghadraoui ◽  
Ahmed Harrach ◽  
Tajddine Lamcharfi ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Low Temperature ◽  
Hydrothermal Method ◽  
Ceramic Materials ◽  
Critical Factors ◽  
Pbtio3 Ceramic ◽  
Perovskite Ceramic

In this work, perovskite ceramic materials of composition Pb1-xCaxTiO3 (PCxT) were elaborated by the hydrothermal method at relatively low temperature. In a basic environment, pressure and temperature are critical factors...

Low temperature dielectric properties and NTCR behavior of the BaFe0.5Nb0.5O3 double perovskite ceramic

2020 ◽  
Vol 22 (5) ◽  
pp. 2986-2998 ◽  
Author(s):  
Vijay Khopkar ◽  
Balaram Sahoo
Keyword(s):  
Dielectric Properties ◽  
Low Temperature ◽  
Temperature Coefficient ◽  
Negative Temperature Coefficient ◽  
Double Perovskite ◽  
Negative Temperature ◽  
Lead Free ◽  
Temperature Coefficient Of Resistance ◽  
Perovskite Ceramic

The microstructure and low-temperature dielectric properties of lead-free BaFe0.5Nb0.5O3 ceramics exhibiting a negative temperature coefficient of resistance behavior.

scholarly journals Influence of Strontium on the Structural and Dielectric Properties of Hydrothermally Processed PbTiO3 Ceramic

2020 ◽  
Vol 32 (3) ◽  
pp. 597-601
Author(s):  
E.H. Lahrar ◽  
O. El Ghadraoui ◽  
A. Harrach ◽  
M. Zouhairi ◽  
T. Lamcharfi ◽  
...  
Keyword(s):  
Hydrothermal Process ◽  
Ceramic Materials ◽  
X Ray Diffraction ◽  
Homogeneous Microstructure ◽  
Impedance Spectroscopy Study ◽  
State Pressure ◽  
Perovskite Type ◽  
Sem Morphology ◽  
Pbtio3 Ceramic ◽  
Perovskite Ceramic

Perovskite ceramic materials of the composition Pb1-xSrxTiO3 (PSxT) were prepared by hydrothermal process at a relatively low temperature. The solution of KOH favours the solubility of the precursors in solid state. Pressure and temperature are critical factors for the formation of pure perovskite PSxT phase. The reaction mixture in stoichiometric amount is put in an autoclave and treated at 180 ºC for 24 h. The powder obtained after grinding is treated at 400 ºC for 4 h. X-ray diffraction shows that the compounds crystallize in a pure phase of perovskite type. SEM morphology indicates a homogeneous microstructure of the grains with the presence of pores. The impedance spectroscopy study in the frequency range (1 KHz − 2 MHz) confirms the insertion of stronium into the lead titanate matrix and highlights the strontium effect on the transition temperature (Tc) and the value of dielectric permittivity (εr).

Phase Transformation Behavior of Bi2O3-ZnO-Nb2O5 Ceramics Sintered at Low Temperature

2007 ◽  
Vol 534-536 ◽  
pp. 1477-1480
Author(s):  
Fu Thang Shiao ◽  
Han Chou Ke ◽  
Ying Chieh Lee
Keyword(s):  
Phase Transformation ◽  
Dielectric Properties ◽  
Low Temperature ◽  
Low Temperatures ◽  
Ceramic Materials ◽  
Synthesis Process ◽  
Cubic Phase ◽  
Test Results ◽  
Transformation Behavior ◽  
Test Materials

To co-fire with commercial LTCC (Low Temperature Co-fired Ceramic) materials at 850oC ~ 880 oC, different contents of B2O3 were added to the Bi2O3-ZnO-Nb2O5 (BZN) ceramics. The dielectric properties of BZN ceramics sintered at low temperatures were studied. According to the test results, the cubic phase of BZN was transformed into orthorhombic in all the test materials. A BiNbO4 phase was formed in test materials with 2 ~ 5 wt% of B2O3 addition. The BiNbO4 phase was inhibited by extra ZnO addition. The phase transformation of cubic BZN was controlled during the synthesis process of cubic and orthorhombic ZnO-Nb2O5 phase with excess ZnO content. The Cubic and orthorhombic phases of BZN could coexist and be sintered densely at 850 oC/2hr.

Energy saving technology for sintering of black bricks from high-siliceous clay

MRS Advances ◽  
2020 ◽  
Vol 5 (61) ◽  
pp. 3123-3131
Author(s):  
Mario Flores Nicolas ◽  
Marina Vlasova ◽  
Pedro Antonio Márquez Aguilar ◽  
Mykola Kakazey ◽  
Marcos Mauricio Chávez Cano ◽  
...  
Keyword(s):  
Low Temperature ◽  
Oxygen Deficiency ◽  
Glass Ceramics ◽  
Total Content ◽  
Ceramic Materials ◽  
Ternary Mixtures ◽  
High Porosity ◽  
Reducing Conditions ◽  
Binary And Ternary Mixtures ◽  
Dark Color

AbstractThe low-temperature synthesis of bricks prepared from high-siliceous clays by the method of plastic molding of blanks was used. For the preparation of brick blanks, binary and ternary mixtures of high-siliceous clays, black sand, and bottle glass cullet were used. Gray-black low-porosity and high-porosity ceramics was obtained by sintering under conditions of oxygen deficiency. It has been established that to initiate plastic in mixtures containing high-siliceous clay, it is necessary to add montmorillonite/bentonite additives, carry out low-temperature sintering, and introduce low-melting glass additives with a melting point ranging from 750 to 800 °C. The performed investigations have shown that the sintering of mixtures with a total content of iron oxide of about 5 wt% under reducing conditions at Tsint. = 800°C for 8 h leads to the formation of glass ceramics consisting of quartz, feldspars, and a phase. The main sources of the appearance of a dark color is the formation of [Fe3+O4]4- and [Fe3+O6]9- anions in the composition of the glass phase and feldspars. By changing the contents of clay, sand, and glass in sintering, it is possible to obtain two types of ceramic materials: (a) in the form of building bricks and (b) in the form of porous fillers.

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