Sol–gel formation, Mössbauer studies, optical absorption and impedance characteristics of Ba0.5Sr0.5Zn0.2Fe0.8O3−ξ powder

2012 ◽  
Vol 136 (1) ◽  
pp. 28-35 ◽  
Author(s):  
Shivendra Kumar Jaiswal ◽  
Jitendra Kumar
Keyword(s):  
Optical Absorption ◽  
Sol Gel ◽  
Gel Formation ◽  
Mössbauer Studies ◽  
Impedance Characteristics

On the Sol-Gel Synthesis and Structure, Electronic and Ionic Conductivities and Impedance Behavior of Y, Fe Co-Doped SrTiO3 Mixed Conductor

2018 ◽  
Vol 281 ◽  
pp. 774-781
Author(s):  
Ke Shan ◽  
Feng Rui Zhai ◽  
Nan Li ◽  
Zhong Zhou Yi
Keyword(s):  
Electrical Conductivity ◽  
Ionic Conductivity ◽  
Ionic Conduction ◽  
Sol Gel ◽  
Ionic Conductivities ◽  
Wide Frequency Range ◽  
Mixed Conductor ◽  
Doping Amount ◽  
Impedance Characteristics ◽  
Sol Gel Synthesis

A single phase perovskite, YxSr1−xTi0.6Fe0.4O3-δ(x=0.06-0.09), was fabricated at 1350°C in air by sol-gel method. The effects of Y-and Fe-doping into SrTiO3on phase structure, electrical conductivity, ionic conductivity and its impedance behavior were investigated. The optimized Y0.07Sr0.93Fe0.4Ti0.6O3-δsample exhibits an electrical conductivity of 0.135 S·cm-1at 800 °C. Y-doping decreases the migration energy for oxygen ions, leading to a significant increase in ionic conductivity. The ionic conductivity of Y0.09Sr0.91Ti0.6Fe0.4O3-δsample varies from 0.0052 S· cm-1at 600°C to 0.02 S·cm-1at 800°C. Impedance characteristics over a wide frequency range of 0.01Hz-100 KHz reveal that the resistance of ionic conduction is predominantly influenced by grain boundary, the relaxation time of which decreases with increase of Y-doping amount.

Specific features of the sol-gel formation and optical properties of 3d metal/porous silicon composites

2014 ◽  
Vol 48 (4) ◽  
pp. 551-555 ◽  
Author(s):  
A. S. Lenshin ◽  
P. V. Seredin ◽  
D. A. Minakov ◽  
V. M. Kashkarov ◽  
B. L. Agapov ◽  
...  
Keyword(s):  
Optical Properties ◽  
Porous Silicon ◽  
Sol Gel ◽  
Gel Formation

Structural, dielectric and Mossbauer studies of sol-gel synthesized nano Ni-Cu-Zn ferrites

2013 ◽  
Author(s):  
Mohd Hashim ◽  
Alimuddin ◽  
S. S. Meena ◽  
Shalendra Kumar ◽  
Sagar E. Shirsath ◽  
...  
Keyword(s):  
Sol Gel ◽  
Mössbauer Studies

X-ray diffraction and Mossbauer studies on superparamagnetic nickel ferrite (NiFe2O4) obtained by the proteic sol–gel method

2015 ◽  
Vol 163 ◽  
pp. 402-406 ◽  
Author(s):  
N.A.S. Nogueira ◽  
V.H.S. Utuni ◽  
Y.C. Silva ◽  
P.K. Kiyohara ◽  
I.F. Vasconcelos ◽  
...  
Keyword(s):  
Nickel Ferrite ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Mössbauer Studies ◽  
X Ray ◽  
Sol Gel Method

Preparation of LaFeO3 particles by sol-gel technology

1998 ◽  
Vol 13 (2) ◽  
pp. 451-456 ◽  
Author(s):  
C. Vázquez-Vázquez ◽  
P. Kögerler ◽  
M. A. López-Quintela ◽  
R. D. Sánchez ◽  
J. Rivas
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Infrared Spectroscopy ◽  
Sol Gel ◽  
Diffraction Peak ◽  
Gel Formation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ferromagnetic Component ◽  
Peak Broadening

The study of submicroscopic particles in already known systems has resulted in a renewed interest due to the large differences found in their properties when the particle size is reduced, and because of possible new technological applications. In this work we report the preparation of LaFeO3 particles by the sol-gel route, starting from a solution of the corresponding metallic nitrates and using urea as gelificant agent. Gels were decomposed at 200 °C and calcined 3 h at several temperatures, T, in the range 250–1000 °C. The samples were structurally characterized by x-ray diffraction (XRD) showing that the orthoferrite crystallizes at T as low as 315 °C. From the x-ray diffraction peak broadening, the particle size was determined. The size increases from 60 to 300 nm as the calcination T increases. Infrared spectroscopy was used to characterize gels and calcined samples. From these studies a mechanism for the gel formation is proposed. Study of the magnetic properties of LaFeO3 particles shows the presence of a ferromagnetic component which diminishes as the calcination temperature increases, vanishing at T = 1000 °C.

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