scholarly journals Preparation of ReFeO3 nanocrystalline powders by auto-combustion of citric acid gel

2009 ◽  
Vol 4 (5) ◽  
pp. 518-521 ◽  
Author(s):  
Anhua Wu ◽  
Guofeng Cheng ◽  
Hui Shen ◽  
Jiayue Xu ◽  
Yaoqing Chu ◽  
...  
Keyword(s):  
Citric Acid ◽  
Nanocrystalline Powders ◽  
Auto Combustion ◽  
Acid Gel

Effect of fuel content on luminescence and antibacterial properties of zinc oxide nanocrystalline powders synthesized by the combustion method

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 97770-97782 ◽  
Author(s):  
Trilok K. Pathak ◽  
Ashwini Kumar ◽  
C. W. Swart ◽  
H. C. Swart ◽  
R. E. Kroon
Keyword(s):  
Zinc Oxide ◽  
Citric Acid ◽  
Antibacterial Properties ◽  
Combustion Method ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Nanocrystalline Powders ◽  
Nitrate Hexahydrate ◽  
Citric Acid Monohydrate ◽  
Zno Powders

Nanoscale ZnO powders were synthesized via the combustion method using zinc nitrate hexahydrate as the source (oxidant) material and urea, and glycine or citric acid monohydrate as fuels.

INFLUENCE OF pH ON PHYSICAL PROPERTIES OF NICKEL-ZINC NANOCRYSTALLINE POWDERS SYNTHESIZED BY A SOL-GEL AUTO-COMBUSTION METHOD

2008 ◽  
Vol 22 (18n19) ◽  
pp. 3153-3158 ◽  
Author(s):  
M. R. BARATI ◽  
S. A. SEYYED EBRAHIMI ◽  
A. BADIEI
Keyword(s):  
Crystallite Size ◽  
Zinc Ferrite ◽  
Ph Value ◽  
Sol Gel ◽  
Combustion Process ◽  
Nanocrystalline Powders ◽  
Nanocrystalline Powder ◽  
Nickel Zinc ◽  
Auto Combustion ◽  
Influence Of Ph

In this research a sol-gel auto-combustion route has been proposed to synthesize nickel-zinc ferrite nanocrystalline powder, using metal nitrates, citric acid as fuel and ammonia as pH adjusting agent. The influence of pH value of the solution on phase evolution, crystallite size and morphology of as-burnt powders were investigated by XRD, SEM and TEM techniques. The results revealed that with pH=7 the single phase nickel-zinc ferrite nanocrystalline powders with crystallite size of about 27nm were formed directly after auto combustion process.

scholarly journals Composition, Microstructure, and Electrical Properties Control of the Powders Synthesized by Sol–Gel Auto-Combustion Method Using Citric Acid as the Fuel

2017 ◽  
Vol 12 (1) ◽  
Author(s):  
Bogdan K. Ostafiychuk ◽  
Larysa S. Kaykan ◽  
Julia S. Kaykan ◽  
Bogdan Ya. Deputat ◽  
Olena V. Shevchuk
Keyword(s):  
Citric Acid ◽  
Electrical Properties ◽  
Sol Gel ◽  
Combustion Method ◽  
Auto Combustion

The effect of induced strains on the optical band gaps in lanthanum-doped zinc ferrite nanocrystalline powders

2016 ◽  
Vol 30 (18) ◽  
pp. 1650230 ◽  
Author(s):  
Fathalla Hamed ◽  
Tholkappiyan Ramachandran ◽  
Vishista Kurapati
Keyword(s):  
Zinc Ferrite ◽  
Nir Spectroscopy ◽  
Band Gaps ◽  
Nanocrystalline Powders ◽  
X Ray Diffraction ◽  
Porous Network ◽  
X Ray ◽  
Optical Band Gaps ◽  
Preparation Conditions ◽  
Auto Combustion

ZnFe[Formula: see text]La[Formula: see text]O4 nanocrystalline powders were synthesized by auto-combustion with the aid of glycine as fuel. The synthesized powders were subjected to heat treatment in air at constant temperatures (600–970[Formula: see text]C) for a period of 2 h. The annealed powders were characterized by X-ray diffraction (XRD), Fourier transformation infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and UV–Vis–NIR spectroscopy. The as-synthesized and annealed powders formed spongy porous network structure with voids and pores. All the powders were found to be single phase nanomaterial with cubic spinel crystal structure and the desired composition; however, they contained strains, dislocations and lattice distortions. Some of these strains and dislocations are relaxed as a function of annealing temperature. The powders displayed direct and indirect optical band gaps. The energies of these band gaps were found to vary as a function of the induced strains and dislocations. It is suggested that the energy of the optical band gap in lanthanum-doped zinc ferrite nanocrystalline powders can be varied as a function of induced strains if the initial preparation conditions and the following heat treatments are controlled.

Dielectric Characteristics of Donor Doped Nonlead Ba(Cu1/3Nb2/3)O3 Perovskite Material Synthesized by Microwave-assisted Citrate-nitrate Sol-gel Route

2007 ◽  
Vol 997 ◽  
Author(s):  
Alp Manavbasi ◽  
Jeffrey C LaCombe
Keyword(s):  
Sol Gel ◽  
Particle Morphology ◽  
Ferroelectric Ceramic ◽  
Copper Nitrate ◽  
Correlation Spectroscopy ◽  
Nanocrystalline Powders ◽  
Microwave Assisted ◽  
Precursor Material ◽  
Auto Combustion ◽  
Diffraction Patterns

AbstractNonlead perovskite type, Ba(Cu1/3Nb2/3−xWx)O3 (x = 0, 0.025), ferroelectric ceramic powders (BCN) were prepared by the microwave-assisted citrate-nitrate sol-gel technique. The gel was formed from a stable and homogeneous sol prepared by mixing stable solutions of barium- and copper-nitrate, tungsten citrate, and peroxo-citrato-niobium precursors. Microwave irradiation of the gel resulted in a dark, fluffy precursor material after auto-combustion. Calcination of the as-combusted samples produces a single phase with tetragonal splitting in X-Ray diffraction patterns. The crystallite size of the synthesized samples was found to be 41 nm. Particle morphology and the size of nanocrystalline powders were characterized by scanning electron microscopy and photon correlation spectroscopy, respectively. Electrical and dielectric properties of sintered samples were investigated by impedance spectroscopy. The isothermal ac measurements were performed from room temperature, up to 600 °C for W6+ doped and undoped BCN samples.

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