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Magnetic Behaviour of the Ce-Co-Mn Intermetallics of MgCu₂ Structure Type

100%

Dudric R., Popescu A., Isnard O., Pop V., Coldea M.

Acta Physica Polonica A

2015

vol. 128

issue 1

67-71

The magnetic properties of CeCoMn, Ce₃Co₃Mn₄ and Ce₃Co₆Mn alloys have been investigated by magnetization and susceptibility measurements in the temperature range (5-300) K and magnetic field up to 12 T. X-ray powder diffraction measurements showed that all three alloys are isostructural and crystallize in the cubic MgCu₂ structure type. Both Ce and Co atoms are non-magnetic in all alloys like in the isostructural compound CeCo₂. Magnetic behavior of the investigated alloys is mostly due to the Mn moments and depends essentially on the Mn-Mn distances. The interaction between the Mn moments is antiferromagnetic in CeCoMn and Ce₃Co₃Mn₄ but a paramagnetic behavior for Ce₃Co₆Mn was evidenced in the studied temperature range.

Mutant HFE genotype leads to significant iron overload in patients with liver diseases from western Romania

86%

Neghina A.-M., Anghel A., Sporea I., Popescu A., Neghina R., Collins A., Thorstensen K.

Journal of Applied Genetics

2009

vol. 50

issue 2

173-176

The present study aimed at assessing the frequency of HFE mutations (C282Y, H63D and S65C) in western Romanian patients with liver disease of diverse aetiologies suspected of iron overload. A total of 21 patients, all Romanian residents hospitalized with clinical suspicion of iron overload and liver disease, were assayed for C282Y, H63D and S65C mutations, serum ferritin and viral hepatitis markers. Overall, 9 out of the 21 patients (42.86%) were found to harbour mutations in the HFE gene: 4 homozygotes C282Y (19.0%), 1 compound heterozygote C282Y/H63D (4.8%), 1 single heterozygote C282Y (4.8%), 2 single heterozygotes H63D (9.5%), 1 single heterozygote S65C (4.8%), and 12 wild-type cases (57.1%). Among the subgroup of 10 patients with the most prominent signs of iron overload (hyperferritinaemia and/or hepatocyte iron score 1), without hepatocellular carcinoma, the HFE genotypes were conclusive in 5 cases (50%). They had significantly increased ferritin levels compared to wild-type cases (P = 0.029). The inclusion of iron studies during routine clinical visits, coupled with the availability of HFE genotyping for family and population studies, should facilitate the early detection of hereditary haemochromatosis in Romania.

Magnetic Properties of Bulk and Thin Nd₂Fe₁₄B Films after Corrosion Action

86%

Constantin V., Neacşu E., Popescu A., Galyas A., Demidenko O., Yanushkevich K.

Acta Physica Polonica A

2015

vol. 127

issue 2

368-370

The corrosion action for bulk and thin Nd₂Fe₁₄B films magnets in different corrosion media was studied. The thin Nd-Fe-B films of 100 nm ≤ d ≤ 1000 nm were deposited on glass substrate by "flash" evaporation method. The structure and microstructure of the samples were studied by X-ray diffraction analysis, scanning electron microscopy. The temperature dependence of the magnetization before and after corrosion action was carried out by ponderomotive method in the temperature range 80 ≤ T ≤ 800 K. It is shown that the specific magnetizations of the thin Nd-Fe-B films with d ≥ 1000 nm are comparable to those measured for the powder samples. The values of the coercive and saturation fields were determined from the hysteresis loops measurements.

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2 Acta Physica Polonica A

1 Journal of Applied Genetics

2 2015

1 2009

3 Popescu A.

1 Anghel A.

1 Coldea M.

1 Collins A.

1 Constantin V.

1 Demidenko O.

1 Dudric R.

1 Galyas A.

1 Isnard O.

1 Neacşu E.

1 Neghina A.-M.

1 Neghina R.

1 Pop V.

1 Sporea I.

1 Thorstensen K.

1 Yanushkevich K.

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Magnetic Behaviour of the Ce-Co-Mn Intermetallics of MgCu₂ Structure Type

Mutant HFE genotype leads to significant iron overload in patients with liver diseases from western Romania

Magnetic Properties of Bulk and Thin Nd₂Fe₁₄B Films after Corrosion Action