Bulk magnetization, temperature - Dependent ac susceptibility and dc resistivity study on Mn0.7+Zn0.3Si Fe2-2O4 (x = 0.0–0.3) spinel ferrites

2020 ◽  
Vol 593 ◽  
pp. 412302 ◽  
Author(s):  
K.G. Saija ◽  
N.H. Vasoya ◽  
S.K. Modi ◽  
U.M. Meshiya ◽  
K.K. Jani ◽  
...  
Keyword(s):  
Ac Susceptibility ◽  
Spinel Ferrites ◽  
Dc Resistivity ◽  
Temperature Dependent ◽  
Resistivity Study ◽  
Bulk Magnetization

A Kinetic study of Tb3+ and Dy3+ co-substituted CoFe2O4 spinel ferrites using temperature dependent XRD, XPS and SQUID measurements

2020 ◽  
Vol 46 (10) ◽  
pp. 15943-15948 ◽  
Author(s):  
Salma Ikram ◽  
Jolly Jacob ◽  
K. Mahmood ◽  
Khurram Mehboob ◽  
Mutaiba Maheen ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Spinel Ferrites ◽  
Temperature Dependent

INTERGRANULAR PROPERTIES OF (Y1-x-yZrxCay)Ba2Cu3O7-δ COMPOUNDS

1999 ◽  
Vol 13 (13) ◽  
pp. 1645-1654 ◽  
Author(s):  
I. GR. DEAC ◽  
E. BURZO ◽  
A. V. POP ◽  
V. POP ◽  
R. TETEAN ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Ac Susceptibility ◽  
Temperature Dependent ◽  
Susceptibility Data ◽  
Dc Magnetic Field ◽  
Complex Susceptibility ◽  
Granular Superconductors ◽  
Intergranular Critical Current Density

The intergranular properties of ( Y 1-x-y Zr x Ca y) Ba 2 Cu 3 O 7-δ ceramics were studies by using temperature-dependent ac susceptibility measurements at zero dc magnetic field. The intergranular critical current density was determined from ac susceptibility data by varying the field amplitude H ac . From the imaginary part of the complex susceptibility, χ″(T), we have determined the temperature dependence of the critical current density by using the Bean's model. The ac field dependencies of the intergrain χ″-peak temperatures T p are linear and agree with Müller critical state model. The results were analyzed in terms of superconductor-insulator-superconductor (SIS)-and superconductor-normal-superconductor (SNS)-type models for granular superconductors.

Detailed field- and temperature-dependent ac-susceptibility study of Ru-dopedCeFe2

1995 ◽  
Vol 51 (5) ◽  
pp. 2872-2880 ◽  
Author(s):  
D. Wang ◽  
H. P. Kunkel ◽  
Gwyn Williams
Keyword(s):  
Ac Susceptibility ◽  
Temperature Dependent ◽  
Susceptibility Study

CHARACTERIZATION AND MICRO-RAMAN STUDIES OF Bi2−xPbxSr2Ca2Cu3O10+δ (0 ≤ x ≤ 0.6) SUPERCONDUCTOR

1994 ◽  
Vol 08 (10) ◽  
pp. 591-603
Author(s):  
U. SINHA ◽  
S. SATHAIAH ◽  
R. N. SONI ◽  
H. D. BIST ◽  
S. C. MATHUR ◽  
...  
Keyword(s):  
Ac Susceptibility ◽  
Solubility Limit ◽  
Dc Resistivity ◽  
Apical Oxygen ◽  
X Ray Diffraction ◽  
Phonon Modes ◽  
X Ray ◽  
Percentage Volume ◽  
Pb Substitution ◽  
Scanning Electron

The X-ray diffraction (XRD), ac susceptibility, dc resistivity, and scanning electron microscopy (SEM) measurements on Bi 2−x Pb x Sr 2 Ca 2 Cu 3 O 10+δ (x = 0.0, 0.2, 0.4, and 0.6) superconductors have been correlated with the Raman scattering studies. Remarkable increases in the transition temperature and percentage volume of high T c phase are found till x = 0.4. Raman spectra also reveal dramatic changes at x = 0.4 in the phonon modes at 625 and 460 cm −1 associated with oxygen vibrations in BiO plane and apical oxygen of CuO 5 pyramid, respectively. The observed changes have been attributed to the phenomenon of oxygen redistribution among various layers. Optimum solubility limit of Pb substitution is found to be x = 0.4.

Relation of starting precursors to the resulting high-Tc phases in the Pb and Sb doped Bi—Sr—Ca—Cu—O system

1994 ◽  
Vol 9 (2) ◽  
pp. 292-296 ◽  
Author(s):  
F. Constantinescu ◽  
R. Holiastou ◽  
D. Niarchos ◽  
G.K. Nicolaides ◽  
F. Vasiliu ◽  
...  
Keyword(s):  
Ac Susceptibility ◽  
Partial Substitution ◽  
Dc Resistivity ◽  
Squid Magnetometry ◽  
Superconducting Properties ◽  
X Ray Diffraction ◽  
High Tc ◽  
X Ray ◽  
Phase Sample ◽  
Semiconducting Behavior

The introduction of more reactive precursors for Pb and Sr (oxalates), as well as Ca (citrate) and the use of a Bi nitrate decomposition route, has increased the percentage of the high-Tc (2223) phase in the Bi—Sr—Ca—Cu—O (BSCCO) system. Partial substitution of Bi(Pb) with Sb gives an almost single (2223) phase sample. In addition, a single (2212) phase sample is obtained when high purity Bi2O3 is used as a precursor, whereas Bi acetate leads to semiconducting behavior. The morphology of the samples is studied with a scanning electron microscope (SEM), the stoichiometry with energy-dispersive x-ray analysis (EDAX), and the structure with x-ray diffraction (XRD), while the superconducting properties are investigated by dc-resistivity, ac-susceptibility, and SQUID magnetometry techniques.

scholarly journals Studies on Anomalous Behaviour at Curie Point Tc of Some Classes of Mixed Ferrites

1970 ◽  
Vol 41 (3) ◽  
pp. 171-180 ◽  
Author(s):  
M Tofazzal Hossain ◽  
Suravi Islam ◽  
Mokbul Hossain Mondal ◽  
AH Khan
Keyword(s):  
Curie Temperature ◽  
Curie Point ◽  
Comparative Studies ◽  
Anomalous Behaviour ◽  
Manufacturing Processes ◽  
Dc Resistivity ◽  
Temperature Dependent ◽  
Mixed Ferrites ◽  
C Value ◽  
Magnetic Ions

A comparative studies on anomalous behaviour at Curie point between clay additives Mn-Zn ferrites and other mixed ferrites such as Mn-Zn, Ni-Zn, Mg-Mn and Ni-Mg have been carried out in this investigation. The changes in Tc on compositions, additives and manufacturing processes of such soft mixed ferrites have been determined from the temperature dependent dc resistivity data and the log ρ vs. (1/1000T) graphs. It is observed that the Curie temperature is dependent on compositions, additives, manufacturing process and microstructure. Definite changes of Curie points of clay additives Mn-Zn ferrites with other ferrites were observed. Both the Mn-Zn ferrites and clay additives Mn-Zn ferrites showed some changes in their T sub>c behavior. The T sub>c value of Mn-Zn ferrites with clay additives decreases with increasing additives. In the case of clay substituted Mn-Zn ferrites the decrease of Curie point can be understood by a decrease of the number of Fe3+ magnetic ions substituted by nonmagnetic Al3+ ions on O sites of the system. Bangladesh J. Sci. Ind. Res. 41(3-4), 171-180, 2006

SYNTHESIS OF NOVEL MANGANESE-BASED SINGLE-MOLECULE NANOMAGNETS

2002 ◽  
Vol 01 (05n06) ◽  
pp. 455-459 ◽  
Author(s):  
JINKWON KIM ◽  
HAENGKYU CHO ◽  
AHKILESH K. GUPTA ◽  
JIN MOOK LIM ◽  
YOUNGKYU DO
Keyword(s):  
Magnetic Susceptibility ◽  
Magnetic Anisotropy ◽  
Single Crystal ◽  
Single Molecule ◽  
Ac Susceptibility ◽  
Ac Magnetic Susceptibility ◽  
Temperature Dependent ◽  
X Ray ◽  
X Ray Crystallography

New Mn12 single-molecule nanomagnets [ Mn 12 O 12( O 2 CCHCl 2)( H 2 O )4]· 2CH 2 Cl 2· H 2 O and [ Mn 12 O 12( O 2 CCHCl 2)( H 2 O )4]· 2CH 3 C 6 H 5· 4H 2 O and novel Mn18 complexes [ M 18 O 14( O 2 CR )18( hmp )4( hmpH )2( H 2 O )2] (R=Me, Et) have been synthesized and characterized by single crystal X-ray crystallography and dc- and ac-magnetic susceptibility measurements. Mn12 complexes show characteristic SMM properties, such as temperature-dependent out-of-phase ac-susceptibility. Mn18 does not show relaxation behaviors down to 2.0 K, but reveals magnetic anisotropy in reduced magnetization experiment.

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