Room-temperature Ferroelectricity and Ferromagnetism in Double Perovskite Bi2CoMnO6 Ceramics Synthesized Using Sol–Gel Combustion Technique

A high performance NaxCoO2 cathode material for sodium ion batteries has been synthesized using a sol–gel combustion technique using glycine as a chelating agent.

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Sol-Gel Combustion Synthesis of Silica/ Carbon Black Pigment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.554-556.636 ◽

2012 ◽

Vol 554-556 ◽

pp. 636-639

Author(s):

Qi Fu Bao ◽

Wei Xia Dong ◽

Qi Bing Chang ◽

Jian Er Zhou

Keyword(s):

High Temperature ◽

Carbon Black ◽

Combustion Synthesis ◽

Raw Materials ◽

Sol Gel ◽

Black Pigment ◽

Prepared Sample ◽

Gel Combustion ◽

Combustion Technique

A green silicon-containing carbon black pigment was synthesized via a sol-geo combustion technique using TEOS and black ink as raw materials. The obtained black pigment was characterized by XRD, TEM and UV-vis absorption spectrophotometer. The results show that the silicon coated with carbon black pigment can be formed at pH ≥ 2 and the black pigment does not change its color after calcinations at 1300 °C in air implying the carbon black is coated completely with SiO2. When pH is 4, the properties of as-prepared sample are similar with the conventional high-temperature pigment. XRD and SEM further confirm that silicon coats with carbon black fully. The silica/ carbon black pigment may represent an opportunity for the applications in the decoration of the high-temperature ceramic.

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Structural, Morphological and Thermal Decomposition Studies of Calcium and Hafnium Modified BaTiO3 Electro Ceramics

10.21203/rs.3.rs-243264/v1 ◽

2021 ◽

Author(s):

Jude Fernandez ◽

B Bindhu ◽

M. Prabu ◽

KY Sandhya

Keyword(s):

Lead Zirconate Titanate ◽

Sol Gel ◽

Lead Zirconate ◽

Ferroelectric Material ◽

Tetragonal Symmetry ◽

X Ray Diffraction ◽

X Ray ◽

Gel Combustion ◽

Combustion Technique ◽

P4mm Space Group

Abstract Calcium and hafnium co-doped barium titanate could be used as a replacement for lead zirconate titanate, which is a lead-based ferroelectric material. Solid state reaction accompanied by the usual sintering technique is the classical ceramic-processing method, which demands a lot of time and effort. The present work aims to make the process a lot easier and quicker by employing a modified sol-gel combustion technique to synthesize polycrystalline Ba0.85Ca0.15Ti(1-x)HfxO3 (x=0.00, 0.05, 0.10, 0.15) electro ceramics . The molar ration is fixed at 1:1 for metal and citric acid at pH ~ 1. It was found that Ba0.85Ca0.15Ti(1-x)HfxO3 (where x=0.00, 0.05, 0.10, 0.15) crystallizes completely at around 1000 °C which is much lower than traditional methods. The structure supposedly displays a tetragonal symmetry with the P4mm space group as confirmed through x-ray diffraction (XRD) and Raman spectroscopy.

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Effect of Heat Treatment on Structural, Magnetic and Electric Properties of Z-Type Barium Cobalt Hexaferrite Powder

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.938.24 ◽

2014 ◽

Vol 938 ◽

pp. 24-29 ◽

Cited By ~ 1

Author(s):

Neha Solanki ◽

G. Packiaraj ◽

Rajshree B. Jotania

Keyword(s):

Heat Treatment ◽

Ac Conductivity ◽

Room Temperature ◽

Sintering Temperature ◽

Sol Gel ◽

Frequency Range ◽

Treatment Conditions ◽

Auto Combustion ◽

Powder Samples ◽

Combustion Technique

Z-type hexaferrite with composition Ba3Co2Fe24O41has been synthesized using a sol-gel auto combustion technique. The obtain combusted powder was sintered at 500 OC and followed by 950 OC for 4 hrs in a muffle furnace. The effect of different sintering temperature on crystal structure, crystallite size, microstructure and dielectric properties were systematically investigated. The prepared barium cobalt hexaferrite powder samples were characterized using different experimental techniques like FTIR, XRD, AC conductivity and specific magnetization measurements. It was observed from XRD results that heat treatment conditions play significant role in the formation of hexaferrite phase. AC conductivity measurements were carried out at room temperature in frequency range of 20Hz to 2MHz. All the samples show the frequency dependent phenomena, i.e. the AC conductivity increases with increasing frequency.

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Magnetic and Electrical Transport Properties of Double Perovskite Sr2FeMoO6Prepared by Sol-Gel Method

E-Journal of Chemistry ◽

10.1155/2011/984862 ◽

2011 ◽

Vol 8 (s1) ◽

pp. S189-S194 ◽

Cited By ~ 5

Author(s):

Yong-Qing Zhai ◽

Jing Qiao ◽

Zhang Zhang

Keyword(s):

Transport Properties ◽

Electrical Transport ◽

Room Temperature ◽

Sol Gel ◽

Double Perovskite ◽

Reducing Agent ◽

Perovskite Oxide ◽

Electrical Transport Properties ◽

Gel Method ◽

Sol Gel Method

With activated carbon for reducing agent, the sol-gel method was used to prepare the giant magnetoresistance materials Sr2FeMoO6, which is the double Perovskite oxide. The structure, morphology, magnetic and electrical transport properties were investigated respectively by x-ray diffraction, scanning electron microscopy and vibrating sample magnetometer. The as-synthesized sample is Sr2FeMoO6with tetragonal crystal structure and I4/mmm space group and unit cell parameter is a = 5.580Å, c = 7.882Å. The primary particles are spherical in shape and the grain size is below 100 nm. The curie temperature is above room temperature and the saturation magnetization is 13.321 A·m2/kg under 1.0 T at room temperature. The sample exhibit typical semiconductor behavior and the conductive mechanism can be described by small polaron variable range hopping model. The room temperature magnetoresistance of the sample under 1.0 T field is up to -10.02%. Moreover, it is found the dosage of citric acid and the amount of reducing agent has great effect on the phase structure and magnetic properties of the samples.

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Structures and properties of Mg0.95Mn0.01TM0.04O (TM = Co, Ni, and Cu) nanoparticles synthesized by sol–gel auto combustion technique

RSC Advances ◽

10.1039/c8ra00816g ◽

2018 ◽

Vol 8 (25) ◽

pp. 14120-14128 ◽

Cited By ~ 5

Author(s):

M. A. Dar ◽

Dinesh Varshney

Keyword(s):

Dielectric Properties ◽

Room Temperature ◽

Sol Gel ◽

Cu Nanoparticles ◽

Structures And Properties ◽

Auto Combustion ◽

Combustion Technique

The room temperature structural, optical and dielectric properties of Mg0.95Mn0.05O and Mg0.95Mn0.01TM0.04O (TM = Co, Ni, and Cu) nanoparticles are reported.

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