Search Results

1 - 10 of 14 items :

  • "magnetic susceptibility" x
Clear All
Contents of Potentially Toxic Metals and Magnetic Susceptibility of Soils Along a Rural – Urban – Rural Gradient in Bratislava City (Slovakia)

efčík P. 1999. Geochemical atlas of Slovak Republic. Part V – Soils. Soil Science and Conservation Research Institute, Bratislava. Č urlík J. & J urkovič Ľ. 2012. Pedogeochémia. Univerzita Komenského v Bratislave, Bratislava, 228 p. D’ emilio M., C hianese D., C oppola R., M acchiato M. & R agosta M. 2007. Magnetic susceptibility measurements as proxy method to monitor soil pollution: Development of experimental protocols for field survey. Environ. Monitor. Assess. 125: 137-146. Ď urža O. 1999. Heavy metals contamination and magnetic

Open access
Iron-containing phases in metallurgical and coke dusts as well as in bog iron ore

.1180/0026461026650054. 8. Thompson, R., & Oldfi eld, F. (1986). Environmental magnetism. London: Allen and Unwin. 9. Rzepa, G., Bajda, T., Gaweł, A., Debiec, K., & Drewniak, L. (2016). Mineral transformations and textural evolution during roasting of bog iron ores. J. Therm. Anal. Calorim., 123(1), 615-630. DOI: 10.1007/s10973-015-4925-1. 10. Dearing, J. A. (1994). Environmental magnetic susceptibility - using the Bartington MS2 System. Kenilworth, England: Chi Publishing. 11. Szumiata, T., Gawroński, M., Górka, B., Brzózka, K., Świetlik

Open access
Features of the structural and magnetic properties of Pb(TixZr1–xO3)-NiFe1.98Co0.02O4 in the polarized state

Abstract

Composites with a 90%Pb(TixZr1-xO3)-10%NiFe1.98Co0.02O4 composition have been synthesized. It has been established that the polarization of samples resulting from exposure to an electric field for 1 hour of 4 kV/mm in strength at a temperature of 400 K leads to crystal structure deformation. The compression of elementary crystal cells in some areas during polarization of the sample creates conditions suitable for the enhancement of magnetic exchange interactions. It has been found that the polarization process of such compositions leads to increases in specific magnetization and magnetic susceptibility. The analysis of Mössbauer spectra has shown that the polarization of the 90%Pb(TixZr1-xO3)-10%NiFe1.98Co0.02O4 composite leads to significant changes in the effective magnetic fields of iron subspectra in various positions.

Open access
Redetermination of Zero-Field Splitting in [Co(qu)2Br2] and [Ni(PPh3)2Cl2] Complexes

Abstract

A mononuclear CoII complex, [Co(qu)2Br2], and NiII complex, [Ni(PPh3)2Cl2], (qu = quinoline, PPh3 = triphenylphosphine) have been reinvestigated. Their crystal and molecular structures are reported along with IR and UV-Vis spectra. Magnetism of both complexes has been studied by using the DC SQUID magnetometry. These complexes exhibit a moderate magnetic anisotropy expressed by zero-field splitting parameter D. The D-value is positive for both complexes with D/hc = +5.94 cm−1 and D/hc = +12.76 cm−1, that is also confirmed by ab initio calculations.

Open access
Magnetic response of bovine spleen

Abstract

Bovine spleen has been used as a sample for deep magnetochemical investigation. Temperature dependence of the magnetic susceptibility and field dependence of the magnetization reveal a paramagnetic behaviour that violates the Curie law. The zero-field cooled magnetization and field cooled magnetization experiments show the bifurcation point at ca T C = 20 K and the blocking temperature T B = 10 K confirming a dominating portion of ferritin along with the organic tissue. There is a remnant magnetization at temperature below 20 K and the search for the magnetic hysteresis was positive.

Open access
Magnetostructural Relationships For Fe(III) Spin Crossover Complexes

Abstract

Structural data for fifteen complexes of Fe(III) of a general formula [FeL5X], with pentadentate Schiff-base ligands L5 and unidentate coligands X, were subjected to a statistical analysis. The multivariate methods such as Pearson correlation, cluster analysis and principal component analysis split the data into two clusters depending upon the low-spin and/or high-spin state of the complex at the temperature of the X-ray experiment. Some of these complexes exhibit a thermally induced spin crossover. The numerical analysis of the magnetic susceptibility and magnetization data for an enlarged set of Fe(III) spin crossover systems yields the enthalpy ΔH and entropy ΔS of the transition along with the transition temperature T 1/2 and the solid state cooperativeness. The thermodynamic data show a mutual relationship manifesting itself by linear ΔS vs ΔH and T 1/2 vs ΔH correlations.

Open access
Utilization of the Spin Symmetry in Fitting the Magnetic Data lor Large Exchange Clusters

Abstract

The Heisenberg Hamiltonian appropriate to exchange clusters commutes with the square of the total spin ant its third component. Therefore in studying the exchange coupled clusters of medium/high nuclearity the spin quantum number S can be utilized in factoring of large interaction matrices (dimension of which is 104 - 105). Then the blocks of much lower size can be diagonalized using the desktop computers. To this end, the eigenvalues form the partition function Z(T,B) from which all thermodynamic properties, including the magnetization M(B,T0) and the magnetic susceptibility χ(T,B0), can be reconstructed. The matrix elements of the interaction operators in the coupled basis set of spin kets have been generated with the help of the irreducible tensor operators for a loop for S = Smin until S = Smax. In addition to the modelling of energy levels for different topologies, a fitting of magnetic data is exemplified by a number of examples like [Fe6] and [Mn3Cr4] systems

Open access
Iron-containing phases in fly ashes from different combustion systems

., François, M., Abdelmoula, M., Refait, Ph., Pellissier, C., & Evrard, O. (1999). Characterization of magnetite in silico-aluminous fly ash by SEM, TEM, XRD, magnetic susceptibility, and Mössbauer spectroscopy. Cement. Concr. Res ., 29 , 1705–1711. DOI: 10.1016/S0008-8846(99)00133-7. 7. Javed, A., Szumiata, T., Morley, N. A., & Gibbs, M. R. J. (2010). An investigation of the effect of structural order on magnetostriction and magnetic behaviour of Fe-Ga thin films. Acta Mater ., 58 , 4003–4011. DOI: 10.1016/j.actamat.2010.03.023. 8. Szumiata, T., Górka, B., Brzózka

Open access
Analysis of heat capacity and Mössbauer data for LuZnSn2 compound

., Kmieć, R., & Pacyna, A. W. J. (2001). Magnetic susceptibility and 119 Sn Mössbauer spectroscopy studies of RAuSn compounds (R=La, Ce, Pr). J. Magn. Magn. Mater ., 224 , 241–248. DOI: 10.1016/S0304-8853(01)00035-X. 12. Łątka, K., Kmieć, R., Kruk, R., Pacyna, A. W., Rams, M., Schmidt, T., & Pöttgen, R. (2003). Exotic phase transitions in RERhSn compounds. Nukleonika , 48 (Suppl. 1), 35–40. 13. Łątka, K., Kmieć, R., Kruk, R., Pacyna, A. W., Rams, M., Schmidt, T., Kotzyba, G., Pöttgen, R., & Johrendt, D. (2003). Structure and properties of CeRhSn – a valence

Open access
Mössbauer and heat capacity studies of ErZnSn2

. Alloy. Compd., 319, 43-49. DOI: 10.1016/S0925-8388(01)00896-9. 11. Łątka, K., Chajec, W., Kmieć, R., & Pacyna, A. W. J. (2001). Magnetic susceptibility and 119Sn Mössbauer spectroscopy studies of RAuSn compounds (R=La, Ce, Pr). J. Magn. Magn. Mater., 224, 241-248. DOI: 10.1016/S0304-8853(01)00035-X. 12. Łątka, K., Kmieć, R., Kruk, R., Pacyna, A. W., Rams, M., Schmidt, T., & Pöttgen, R. (2003). Exotic phase transitions in RERhSn compounds. Nukleonika, 48(S1), S35-S40. 13. Łątka, K., Kmieć, R., Kruk, R., Pacyna, A. W

Open access