Synthesis, Characterization and Exploration of Multiferroic Properties in Nano-Crystalline Tb1−x YxMnO3 (0 ≤ x ≤ 0.4)

2016 ◽  
Vol 16 (4) ◽  
pp. 4094-4099 ◽  
Author(s):  
R Shukla ◽  
Keka R Chakraborty ◽  
B.P Mandal ◽  
S. D Kaushik ◽  
M. D Mukadam ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Specific Heat ◽  
Combustion Method ◽  
Magnetic Phase Transitions ◽  
Specific Heat Measurement ◽  
X Ray Diffraction ◽  
Heat Measurement ◽  
Nano Crystalline ◽  
Gel Combustion ◽  
Gel Combustion Method

We report the synthesis and electric properties of nano-crystalline Tb1−xYxMnO3 (x = 0, 0.1, 0.2, 0.3 and 0.4) compounds prepared by gel-combustion method. These samples were characterized by a number of techniques including X-ray diffraction (XRD), Raman spectroscopy, specific-heat measurement, neutron diffraction, and magnetic field dependent pyrocurrent measurement. All the samples crystallize in the orthorhombic structure with space group Pnma at room temperature. Anomalies were observed in low temperature specific-heat measurement corresponding to magnetic and electric phase transitions. The magnetic phase transitions occurred at ∼35, ∼22–28 and ∼7 K for all the samples. Signatures of coupling between magnetic and electric order parameters were revealed by pyrocurrent measurements carried out in presence of magnetic fields.

scholarly journals Synthesis of Blue-Green Phosphors Sr4Si3O8Cl4:Eu2+by Gel-Combustion Method and Their Luminescent Properties

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yong-Qing Zhai ◽  
Li-Li Wang ◽  
Juan Chen ◽  
Shi-Hua Feng
Keyword(s):  
Broad Band ◽  
Orthorhombic Phase ◽  
Luminescent Properties ◽  
Combustion Method ◽  
Main Peak ◽  
X Ray Diffraction ◽  
Doping Amount ◽  
Gel Combustion ◽  
Main Emission Peak ◽  
Gel Combustion Method

Sr4Si3O8Cl4:Eu2+blue-green phosphors were synthesized by the gel-combustion method. The as-synthesized phosphors were analyzed and characterized by X-ray diffraction and fluorescence spectrophotometer. The results indicate that orthorhombic phaseSr4Si3O8Cl4:Eu2+has been formed after the precursor calcined at 900°C reductive temperature. The excitation spectrum ofSr4Si3O8Cl4:Eu2+is a broad band in the range of 250 ~ 450 nm and the main peak at 324 nm. The emission spectrum is also a broad band with the main emission peak at about 484 nm, which is ascribed to the typical 4f5d1to 4f7transition ofEu2+. Moreover, the effects of the concentration ofEu2+, the reductive temperature, and the doping amount ofMg2+on luminescent properties were discussed.

Electrical and optical properties of SrTiO3 nanopowders: Effect of different dopants Ba and Ag

2016 ◽  
Vol 30 (14) ◽  
pp. 1650207 ◽  
Author(s):  
Mahdi Ghasemifard ◽  
Misagh Ghamari ◽  
Meysam Iziy
Keyword(s):  
Band Gap ◽  
Lattice Structure ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
Dielectric Parameters ◽  
Transmission Electron ◽  
Gel Combustion ◽  
Orbital Configuration ◽  
Gel Combustion Method ◽  
Atomic Radii

Using strontium–titanium salts precursor, nanopowders (STO-based-NPs) were successfully synthesized by controlled gel-combustion method. Citric and nitric acids in an optimum ratio were used as the fuel and oxidizer agents, respectively. After heat treatment at 850[Formula: see text]C, the crystalline structure of the products was investigated by X-ray diffraction. The effects of Ba and Ag dopants on particle size distribution were discussed by transmission electron microscopy (TEM). The optical and dielectric parameters such as energy band gap [Formula: see text], real and imaginary parts of refractive index, dielectric function and energy loss function of nanopowders have been investigated by UV–Vis and FTIR spectra. The band gap of SrTiO3 increased with increasing Ba, Ag and Ba–Ag. Different atomic radii of dopants are responsible for changing optical and dielectric parameters due to the altered orbital configuration of the lattice structure.

scholarly journals Correlation Between Composition and Electrodynamics Properties in Nanocomposites Based on Hard/Soft Ferrimagnetics with Strong Exchange Coupling

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 202 ◽  
Author(s):  
Munirah Abdullah Almessiere ◽  
Alex V. Trukhanov ◽  
Yassine Slimani ◽  
K.Y. You ◽  
Sergei V. Trukhanov ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Sol Gel ◽  
Combustion Method ◽  
X Ray Diffraction ◽  
One Pot ◽  
Linear Behavior ◽  
Gel Combustion ◽  
Pure Exchange ◽  
Strong Exchange ◽  
Gel Combustion Method

In this work, Sr0.3Ba0.4Pb0.3Fe12O19/(CuFe2O4)x (x = 2, 3, 4, and 5) as strongly exchange-coupled nanosized ferrites were fabricated using a one-pot sol–gel combustion method (citrate sol-gel method). The X-ray diffraction (XRD) powder patterns of the products confirmed the occurrence of pure, exchange-coupled ferrites. Frequency dependencies of the microwave characteristics (MW) were investigated using a co-axial method. The non-linear behavior of the MW with the composition transformation may be due to different degrees of Fe ion oxidation on the spinel/hexaferrite grain boundaries and strong exchange coupling during the hard and soft phases.

Li(Ni1/3Co1/3Mn1/3)O2 with High Rate Capability Synthesized via a Novel Gel-Combustion Method

2011 ◽  
Vol 391-392 ◽  
pp. 973-977
Author(s):  
Jing Mao ◽  
Ke Hua Dai ◽  
Yu Chun Zhai
Keyword(s):  
Energy Dispersive Spectrometer ◽  
Rate Capability ◽  
Chelating Agent ◽  
Combustion Method ◽  
Xrd Analysis ◽  
High Rate ◽  
High Rate Capability ◽  
Sem Images ◽  
Gel Combustion ◽  
Gel Combustion Method

Li(Ni1/3Co1/3Mn1/3)O2material with high rate capability was synthesized by a novel gel-combustion method using polyvinylpyrrolidone as a polymer chelating agent and a fuel. X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to study the structure, morphology and element distribution of the Li(Ni1/3Co1/3Mn1/3)O2material. XRD analysis showed that all samples were α-NaFeO2structure and Li(Ni1/3Co1/3Mn1/3)O2prepared at 900 °C had the highest c/a of 4.977 indicating the highest layered-ness. EDS scan demonstrated that the precursor was homogeneous. SEM images indicated all samples were well crystallized. Charge and discharge tests showed all samples had good rate capability. Among them, Li(Ni1/3Co1/3Mn1/3)O2prepared at 900 °C had the highest capacity and the best rate capability. It delivered 162.1 mAh•g−1at 0.25 C between 2.5 and 4.3 V and the capacity retention was about 81% compared to that of 0.25C rate.

scholarly journals Searching for Gap Zeros in Sr2RuO4 via Field-Angle-Dependent Specific-Heat Measurement

2018 ◽  
Vol 87 (9) ◽  
pp. 093703 ◽  
Author(s):  
Shunichiro Kittaka ◽  
Shota Nakamura ◽  
Toshiro Sakakibara ◽  
Naoki Kikugawa ◽  
Taichi Terashima ◽  
...  
Keyword(s):  
Specific Heat ◽  
Specific Heat Measurement ◽  
Heat Measurement
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