Paramagnetic Curie constant of diacetatomanganese(II)

2021 ◽  
pp. 442-443
Author(s):  
R. T. Pardasani ◽  
P. Pardasani
Keyword(s):  
Curie Constant

scholarly journals Dielectric properties of La/Mn codoped barium titanate ceramics

2016 ◽  
Vol 29 (2) ◽  
pp. 285-296 ◽  
Author(s):  
Vesna Paunovic ◽  
Vojislav Mitic ◽  
Milos Marjanovic ◽  
Ljubisa Kocic
Keyword(s):  
Dielectric Properties ◽  
Pechini Method ◽  
Local Area ◽  
Dissipation Factor ◽  
Curie Constant ◽  
Weiss Temperature ◽  
Fine Grained ◽  
Average Grain Size ◽  
Titanate Ceramics ◽  
La Doped

La/Mn codoped BaTiO3 ceramics with various La2O3 content, ranging from 0.3 to 1.0 at% La, were investigated regarding their microstructure and dielectric properties. The content of MnO2 was kept constant at 0.01 at% Mn in all samples. La/Mn codoped and undoped BaTiO3 were obtained by a modified Pechini method and sintered in air at 13000C for two hours. The homogeneous and completely fine-grained microstructure with average grain size from 0.5 to 1.5mm was observed in samples doped with 0.3 at% La. In high doped samples, apart from the fine grained matrix, the appearance of local area with secondary abnormal grains was observed. The dielectric properties were investigated as a function of frequency and temperature. The dielectric permittivity of the doped BaTiO3 was in the range of 3945 to 12846 and decreased with an increase of the additive content. The highest value for the dielectric constant at room temperature (er= 12846) and at the Curie temperature (er= 17738) were measured for the 0.3 at% La doped samples. The dissipation factor ranged from 0.07 to 0.62. The Curie constant (C), Curie-Weiss temperature (T0) and critical exponent (g) were calculated using the Curie-Weiss and the modified Curie-Weiss law. The highest values of Curie constant (C=3.27?105 K) was measured in the 1.0 at% La doped samples. The obtained values for g ranged from 1.04 to 1.5, which pointed out the sharp phase transformation from the ferroelectric to the paraelectric phase.

Vanishing of the ferroelectric state with a finite Curie constant in the hydrogen-bond crystal KD2PO4 at high pressure

1999 ◽  
Vol 112 (12) ◽  
pp. 655-660 ◽  
Author(s):  
S. Endo ◽  
T. Sawada ◽  
T. Tsukawake ◽  
Y. Kobayashi ◽  
M. Ishizuka ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
High Pressure ◽  
Curie Constant ◽  
Ferroelectric State

scholarly journals Synthesis and characterization of Pr substituted Gd-123 high-Tc superconductors

Cerâmica ◽  
2012 ◽  
Vol 58 (347) ◽  
pp. 381-387 ◽  
Author(s):  
V. R. Huse ◽  
V. D. Mote ◽  
Y. Purushotham ◽  
B. N. Dole
Keyword(s):  
Oxygen Deficiency ◽  
Resistivity Measurement ◽  
Charge Carriers ◽  
Electrical Resistivity Measurement ◽  
Chemical Formula ◽  
Curie Constant ◽  
High Tc Superconductors ◽  
High Tc ◽  
Magnetic Pair

High Tc superconducting materials with chemical formula Gd1-xPr xBa2Cu3O7-δ, where x = 0.0, 0.1, 0.2 and 0.3 were prepared by ceramic route. XRD studies confirm the orthorhombic pervoskite structure. Electrical resistivity measurement shows that Tc decreases with increasing Pr concentration. Copper valency and oxygen content decreasing with increasing Pr content. Value of n(CuO2) decreases with increasing x and oxygen deficiency (δ) has a linear dependence with (2x+δ). SQUID investigation reveals that Bohr magneton number and Curie constant are decreasing with increasing Pr concentration. Annihilation of superconductivity may be owing to reduction in CuO2 charge carriers or magnetic pair breaking.

Manifestation of Donor Hybridized Electron States in Magnetism of Nickel Impurities in Mercury Selenide Crystals

2015 ◽  
Vol 233-234 ◽  
pp. 121-124
Author(s):  
T.E. Govorkova ◽  
A.F. Gubkin ◽  
A.T. Lonchakov ◽  
Vsevolod I. Okulov ◽  
M.A. Andriichuk ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Electronic Structure ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Electronic States ◽  
Curie Constant ◽  
Effective Spin ◽  
Mercury Selenide ◽  
Temperature Dependences ◽  
Diluted Magnetic

The temperature dependences of the magnetic susceptibility χ (T) of diluted magnetic semiconductor HgSe:Ni (1·1018 < NNi < 1·1019) cm-3 were investigated. It was found that paramagnetic part of the susceptibility which is wholly due to the effect of the impurities in the range of temperature from 1.8 to 200 K is described by the Curie-Weiss law. The analysis of the concentration dependence of the Curie constant C(NNi) based on the model of the hybridized electronic states was carried out. The application of this model allowed us to determine the microscopic parameters of the electronic structure of these crystals (the effective spin of the hybridized electronic states at the nickel impurity Si and the resonance concentration of donor electrons n0d).

Magnetic ordering and excitation in triangulated anti-ferromagnet Cu9Cl2(cpa)6·nH2O

2001 ◽  
Vol 79 (11-12) ◽  
pp. 1409-1413 ◽  
Author(s):  
M Mekata ◽  
M Abdulla ◽  
M Kubota ◽  
Y Oohara
Keyword(s):  
Inelastic Neutron Scattering ◽  
Magnetic Ordering ◽  
Inelastic Neutron ◽  
Acid Form ◽  
Full Width ◽  
Curie Constant ◽  
Kagome Lattice ◽  
Kagomé Lattice ◽  
Scattering Measurements ◽  
Powder Samples

The Cu2+ ions in Cu9Cl2(cpa)6 · nH2O (cpa is the anion of 2-carboxy pentonic acid) form a slightly deformed Kagome lattice with a smaller triangle plaquette in each triangle of a Kagome lattice showing strong frustration. The anomalous features of magnetism are the reduction of the Curie constant below 50 K, fractional saturation even in a field of 38 T, and nonlinear magnetic susceptibility below 5 K. We performed inelastic neutron scattering measurements on powder samples and observed dispersionless scattering around 6.5 meV with a full width of about 8 meV indicating a single-site excitation with E/kB [Formula: see text] 70 K. The scattering is less conspicuous above 50 K. These results are interpreted in terms of the plaquette-ordering model that assumes a 120° arrangement of three moments on each triangular plaquette and a random freezing of the remaining paramagnetic moments below 5 K. PACS No.: 75.10Hk

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