Sintering temperature dependence on evolving microstructure and magnetic characteristics of cobalt ferrites

2021 ◽  
Author(s):  
N.A.M. Pauzi ◽  
R. Nazlan ◽  
N.M.K. Anuar ◽  
M.A. Jusoh ◽  
I.R. Ibrahim ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Sintering Temperature ◽  
Magnetic Characteristics ◽  
Cobalt Ferrites

Ferromagnetism and Luminescence of Diluted Magnetic Semiconductors GaGdN and AlGdN

2008 ◽  
Vol 1111 ◽  
Author(s):  
Shuichi Emura ◽  
Masahiro Takahashi ◽  
Hiroyuki Tambo ◽  
Akira Suzuki ◽  
Tetsuya Nakamura ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Magnetic Circular Dichroism ◽  
Peak Position ◽  
Magnetic Characteristics ◽  
Sharp Line ◽  
X Ray ◽  
Diluted Magnetic ◽  
X Ray Absorption

AbstractThe magnetic characteristics of the dilute magnetic system GaGdN are investigated by mainly soft-X-ray magnetic circular dichroism (MCD) in energy range of 1160 – 1240 eV. The strong MCD signals up to 30 % at 15K are observed. The temperature dependence of its intensity is not on simple Curie-Weiss curve and depicts three-step curve. A step around 40 – 100K suggests a new magnetic phase. The luminescence spectrum of GaGdN at low temperature is divided into three parts consisting of two broad bands around 432 nm and 503 nm and a sharp peak at 652 nm. This sharp line is assigned to the intra-transition of f – f orbital owing to the weak temperature dependence of the intensity and peak position. AlGdN grown by molecular beam epitaxy produces luminescence at 318.5 nm. X-ray absorption fine structure is examined to survey the occupancy of the Gd ion in the grown specimens.

Sintering Temperature Dependence of Energy-Storage Properties in (Ba,Sr)TiO3 Glass-Ceramics

2011 ◽  
Vol 94 (6) ◽  
pp. 1805-1810 ◽  
Author(s):  
Yong Zhang ◽  
Jiajia Huang ◽  
Tao Ma ◽  
Xiangrong Wang ◽  
Changsheng Deng ◽  
...  
Keyword(s):  
Energy Storage ◽  
Temperature Dependence ◽  
Sintering Temperature ◽  
Glass Ceramics ◽  
Energy Storage Properties ◽  
Storage Properties

scholarly journals Sintering temperature dependence of the photothermal spectra in ceramic CdS

1994 ◽  
Vol 04 (C7) ◽  
pp. C7-315-C7-318
Author(s):  
T. Toyoda ◽  
M. Sorazawa ◽  
S. Ando
Keyword(s):  
Temperature Dependence ◽  
Sintering Temperature

Structural and Magnetic Characteristics of (Eu1-xGax) Ba2Cu3O7-δ High-Tc Superconductors

1997 ◽  
Vol 11 (13) ◽  
pp. 593-597 ◽  
Author(s):  
Iuliu Pop ◽  
Radu Redac ◽  
Gheorghe Borodi ◽  
Virgil Ioncu
Keyword(s):  
Magnetic Susceptibility ◽  
Temperature Dependence ◽  
Concentration Dependence ◽  
Tetragonal Structure ◽  
Magnetic Characteristics ◽  
High Tc Superconductors ◽  
High Tc ◽  
Gallium Concentration ◽  
Paramagnetic Region ◽  
Diamagnetic Transition

The high-T c ( Eu 1-x Ga x) Ba 2 Cu 3 O 7-δ superconductors with x=0, 0.01, 0.02, 0.03, 0.06 and 0.09 were synthesized by a ceramic technique. The gallium concentration dependence of the lattice parameters was determined. A transition from orthorhombic toward tetragonal structure was relevated for the most gallium concentrated sample. The temperature dependence of the magnetic susceptibility pointed out the diamagnetic transition at 78 and 80 K. In the paramagnetic region the magnetic susceptibility exhibits anomal temperature dependence.

COMPARATIVE STUDY OF Bi-2223/Ag SUPERCONDUCTORS DERIVED FROM PARTICLES SIZE OF STARTING MATERIALS

2007 ◽  
Vol 21 (18n19) ◽  
pp. 3246-3249 ◽  
Author(s):  
D. SÝKOROVÁ ◽  
O. SMRČKOVÁ ◽  
K. RUBEŠOVÁ ◽  
P. VAŠEK
Keyword(s):  
Solid State ◽  
Comparative Study ◽  
Temperature Dependence ◽  
Solid State Reaction ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Current Densities ◽  
Size Of Particles ◽  
Micrometer Size

Series of the samples with nominal compositions Bi 3.2 Pb 0.8 Sr 4 Ca 5 Cu 7 O x and Bi 3.2 Pb 0.8 Sr 4 Ca 5 Cu 7 O x / Ag (10 wt%) were prepared by the standard solid state reaction at the same calcination and sintering temperature and time. Three starting mixtures were used, carbonates, oxides and silver i) with nanoparticles, ii) with micrometer size of particles and iii) powder obtained by modified sol-gel process. The main phase in all samples was Bi -2223 and silver formed the separate phase. The sol-gel process was found to be effective way in term of porosity, bulk density and connectivity of the grains. The effect of the microstructure on the transport properties were described by the temperature dependence of resistivity and critical current densities.

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