scholarly journals Synthesis and characterization of manganese ferrite from low grade manganese ore through solid state reaction route

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Salar Ahmad ◽  
Sajjad Ali ◽  
Ikram Ullah ◽  
M. S. Zobaer ◽  
Ashwag Albakri ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Solid State ◽  
Solid State Reaction ◽  
Sintering Temperature ◽  
Low Grade ◽  
Manganese Ore ◽  
Manganese Ferrite ◽  
Reaction Route ◽  
Solid State Reaction Route ◽  
The Impact

AbstractManganese ferrite spinel has been synthesized by using low grade manganese ore and ferric oxide as sources of manganese oxide and iron oxide through solid state reaction route by taking manganese and iron mole ratio of 1:2 respectively. The impact of sintering temperature on phase composition and particle size is investigated. Similarly, the impact of frequency on dielectric constant, dielectric loss, AC (alternating current) conductivity and tangent losses is also investigated. The results shows the presence of spinel structure manganese ferrite (MnFe2O4) as the major phase for the sample sintered at 1200 °C. It has been established that the crystallite size increase with rise in sintering temperature. The surface morphology of the sample sintered at 1200 °C show pyramidal and triangular shape grains. The dielectric constant (εʹ) and dielectric losses (εʹʹ) were observed to decrease with increasing the sintering temperature and frequency. Furthermore, the AC (alternating current) conductivity was found to rise with rise in applied frequency. On the other hand, the tangent losses falls considerably with rise in applied frequency.

Molten Salt Synthesis of Nanocrystalline Phase of High Dielectric Constant Material CaCu3Ti4O12

2008 ◽  
Vol 8 (11) ◽  
pp. 5762-5769 ◽  
Author(s):  
B. Shri Prakash ◽  
K. B. R. Varma
Keyword(s):  
Dielectric Constant ◽  
Grain Size ◽  
Solid State ◽  
Molten Salt ◽  
Solid State Reaction ◽  
Molten Salt Synthesis ◽  
Reaction Route ◽  
Conventional Solid State Reaction ◽  
Phase Pure ◽  
Solid State Reaction Route

Nanocrystalline powders of giant dielectric constant material, CaCu3Ti4O12 (CCTO), have been prepared successfully by the molten salt synthesis (MSS) using KCl at 750 °C/10 h, which is significantly lower than the calcination temperature (∼1000 °C) that is employed to obtain phase pure CCTO in the conventional solid-state reaction route. The water washed molten salt synthesized powder, characterized by X-ray powder diffraction (XRD), Scanning electron microscopy (SEM), and Transmission electron microscopy (TEM) confirmed to be a phase pure CCTO associated with ∼150 nm sized crystallites of nearly spherical shape. The decrease in the formation temperature/duration of CCTO in MSS method was attributed to an increase in the diffusion rate or a decrease in the diffusion length of reacting ions in the molten salt medium. As a consequence of liquid phase sintering, pellets of as-synthesized KCl containing CCTO powder exhibited higher sinterability and grain size than that of KCl free CCTO samples prepared by both MSS method and conventional solid-state reaction route. The grain size and the dielectric constant of KCl containing CCTO ceramics increased with increasing sintering temperature (900 °C–1050 °C). Indeed the dielectric constants of these ceramics were higher than that of KCl free CCTO samples prepared by both MSS method and those obtained via the solid-state reaction route and sintered at the same temperature. Internal barrier layer capacitance (IBLC) model was invoked to correlate the observed dielectric constant with the grain size in these samples.

Preparation and Dielectric Properties of Sm3+-Substituted SrBi8Ti7O27 Based Microwave Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 95-98
Author(s):  
Yan Xiang Wang ◽  
C. Fang ◽  
Min Tang ◽  
Hong Qiu ◽  
Zhao Xian Xiong
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Solid State ◽  
Solid State Reaction ◽  
High Dielectric Constant ◽  
Microwave Ceramics ◽  
Reaction Route ◽  
Solid State Reaction Route ◽  
Dta And Tg ◽  
High Dielectric

Sr(Bi1-xSmx)8Ti7O27 ceramics were prepared by Sm2O3-substitution for Bi2O3 through solid-state reaction route. The dielectric properties of the sintered bodies such as er, Q and tf were investigated. The ceramics were characterized by SEM, XRD, DTA and TG, which behaved high dielectric constant of 128 ~154 at the frequency of 10 GHz.

Influence of Ta substitution for Nb in Zn3Nb2O8 and the impact on the crystal structure and microwave dielectric properties

2016 ◽  
Vol 45 (29) ◽  
pp. 11807-11816 ◽  
Author(s):  
Yonggui Zhao ◽  
Ping Zhang
Keyword(s):  
Crystal Structure ◽  
Dielectric Properties ◽  
Solid State ◽  
Solid State Reaction ◽  
Structural Characteristics ◽  
Microwave Dielectric Properties ◽  
Reaction Route ◽  
Microwave Dielectric ◽  
Solid State Reaction Route ◽  
The Impact

Zn3(Nb1−xTax)2O8 (x = 0.02–0.10) ceramics were prepared via a solid-state reaction route and the dependence of their microwave dielectric properties on their structural characteristics were investigated.

Promoted hydrogen release from ammonia borane with mannitolvia a solid-state reaction route

2012 ◽  
Vol 41 (3) ◽  
pp. 871-875 ◽  
Author(s):  
Yuede Pan ◽  
Yan Wang ◽  
Yanliang Liang ◽  
Zhanliang Tao ◽  
Jun Chen
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Ammonia Borane ◽  
Hydrogen Release ◽  
Reaction Route ◽  
Solid State Reaction Route

Synthesis of ultrafine superconducting MgB2 by a convenient solid-state reaction route

2004 ◽  
Vol 405 (3-4) ◽  
pp. 271-274 ◽  
Author(s):  
Liang Shi ◽  
Yunle Gu ◽  
Tian Qian ◽  
Xiaoguang Li ◽  
Luyang Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Reaction Route ◽  
Solid State Reaction Route

Microwave-hydrothermal accelerated solid state reaction route for the synthesis of La0.5Ba0.5MnO3

2004 ◽  
Vol 58 (5) ◽  
pp. 837-841 ◽  
Author(s):  
S.A. Mirji ◽  
Y.B. Khollam ◽  
S.B. Deshpande ◽  
H.S. Potdar ◽  
R.N. Bathe ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Reaction Route ◽  
Microwave Hydrothermal ◽  
Solid State Reaction Route

scholarly journals Conductivity and giant permittivity study of Zn0.5Ni0.5Fe2O4 spinel ferrite as a function of frequency and temperature

RSC Advances ◽  
2019 ◽  
Vol 9 (56) ◽  
pp. 32395-32402 ◽  
Author(s):  
Mohsen Elain Hajlaoui ◽  
Radhia Dhahri ◽  
Nessrine Hnainia ◽  
Aida Benchaabane ◽  
Essebti Dhahri ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Spinel Ferrite ◽  
Reaction Route ◽  
Different Temperatures ◽  
Solid State Reaction Route

Ni0.5Zn0.5Fe2O4 was prepared by the solid state reaction route at different temperatures.

scholarly journals Chemical Synthesis of Niobium Diboride Nanosheets by a Solid-State Reaction Route

2018 ◽  
Vol 40 (6) ◽  
pp. 392-395 ◽  
Author(s):  
Liangbiao Wang ◽  
Qianli Shen ◽  
Hengfei Qin ◽  
Dejian Zhao ◽  
Weiqiao Liu ◽  
...  
Keyword(s):  
Solid State ◽  
Chemical Synthesis ◽  
Solid State Reaction ◽  
Reaction Route ◽  
Solid State Reaction Route

Effect of Technological Parameters on the Microstructure and Electrical Properties of ZnO Varistors

2013 ◽  
Vol 820 ◽  
pp. 208-211
Author(s):  
Li Li ◽  
Qi Bin Liu
Keyword(s):  
Solid State ◽  
Electrical Properties ◽  
Leakage Current ◽  
Sintering Temperature ◽  
Voltage Gradient ◽  
Technological Parameters ◽  
Reaction Route ◽  
Conventional Solid State Reaction ◽  
Zno Varistors ◽  
Solid State Reaction Route

To improve voltage-gradient and to reduce the sintering temperature of ZnO varistors, high voltage-gradient ZnO varistors were synthesized with a conventional solid state reaction route. By means of SEM and DC parameter instrument for varistor, the influence of different technological parameters on microstructure, voltage-gradient and leakage current of ZnO varistors was investigated. The experimental results show that by using the process that presintering the additives at 850°C, the density is improved, the voltage-gradient is increased, and the leakage current is decreased. The optimum voltage-gradient and leakage current are 371V/mm and 3μA, respectively.

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