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1
Content available remote

Experimental Liver Iron Measurement with the SQUID Gradiometer System

100%
Škrátek M., Šimáček I., Maňka J.
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issue 5
1062-1064
EN
An experimental system for noninvasive measurement of the iron stores in the liver of living human organism has been designed and realized. This system enables to test the presence and to determine the iron concentration in this organ. The principle of operation is based on measurement of small response (magnetic moment) of the paramagnetic protein ferritin to the applied magnetic field on the complex diamagnetic background of other body organs. The experiment was performed by modified SQUID system with the 2nd order gradiometer. At present, the sensitivity of the system is 1 mg Fe per gram of the wet liver, which from the point of view of clinical diagnostics, enables to indicate the state of the liver iron overload, e.g., in hemochromatosis and hemosiderosis.
2
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Magnetometric Measurements of Low Concentration of Coated Fe_{3}O_{4} Nanoparticles

88%
Škrátek M., Šimáček I., Dvurečenskij A., Majerová M., Maňka J.
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vol. 126
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issue 1
396-397
EN
A modified RF SQUID system with the 2^{nd} order gradiometer has been tested for the purposes of detecting the magnetic nanoparticles as potential carriers of biological medicament. The paper presents basic information about the sensitivity of the system and its use for quantification of low concentration of coated Fe_{3}O_{4} magnetic nanoparticles. Model measurements provided information that enabled us to define the parameter influencing the experimental results. The volume of the biological object and its distance from the antenna appear to have the significant influence on the measurement accuracy.
3
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Effects of Ru Addition on the Superconducting Properties of the Eu-123 System

76%
Škrátek M., Cigáň A., Dvurečenskij A., Majerová M., Bystrický R., Billik P., Maňka J.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
225-227
EN
Effects of the Ru addition on the structural and superconducting properties of the Eu-123 system were studied. Samples of the nominal composition EuBa₂Cu_{3-x}Ru_{x}O_{7-δ} with x ranging from 0.0 to 0.7 were prepared by the solid state reaction technique from Eu₂O₃, BaCO₃, CuO and RuO₂ precursors at the temperature of 1050°C for 72 h in flowing oxygen and oxygen-annealed at 580°C for 24 h. X-ray diffraction data show the presence of another Ba-Eu-Ru-O phase, for x ≥ 0.03, in addition to the main superconducting phase. AC and DC magnetization characteristics were measured by the compensation method using the second-order SQUID gradiometer at ≈ 77 K and the QD SQUID magnetometer MPMS XL-7 at 20 K. The superconducting properties, T_{c}, ΔT_{c}, change only weakly up to x = 0.2, and magnetization M(H) deteriorates with an increasing Ru content.
4
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Effects of Gd/Ba Nonstoichiometry in Gd_{1+x}Ba_{2-x}Cu_{3}O_{7-δ} on Superconducting and Magnetic Properties

76%
Majerová M., Cigáň A., Bystrický R., Maňka J., Dvurečenskij A., Škrátek M.
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vol. 126
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issue 1
354-355
EN
Effects of slight nonstoichiometry in Gd_{1+x}Ba_{2-x}Cu_{3}O_{7-δ} compounds on superconducting and magnetic properties were studied. The series of single-phase samples of Gd_{1+x}Ba_{2-x}Cu_{3}O_{7-δ} with composition deviation x from the stoichiometric value of 0 to 0.1 and to -0.1 were synthesized by the solid-state reaction method from Gd_{2}O_{3}, BaCO_{3} and CuO precursors, sintered at the temperature of ~ 1000°C in flowing oxygen and annealed at 450°C for 24 h.
5
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Magnetic Studies of EuBa₂Cu_{3-x}RuₓO_{7-δ} Compounds

76%
Dvurečenskij A., Cigáň A., Bystrický R., Škrátek M., Billik P., Majerová M., Maňka J.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
300-302
EN
Effects of Ru addition on magnetic properties of EuBa₂Cu_{3-x}RuₓO_{7-δ} compounds were studied. Samples of EuBa₂Cu_{3-x}RuₓO_{7-δ} with x from 0.00 to 0.70 were prepared by the solid state reaction technique from Eu₂O₃, BaCO₃, CuO and RuO₂ precursors. Temperature dependences of the zero-field cooled (ZFC) and the field cooled (FC) DC magnetic moment at low and high applied magnetic field Hₐ were measured by the QD SQUID magnetometer MPMS XL-7 and AC magnetization M_{AC}(H) curves at 77 K by the compensation method using the second-order SQUID gradiometer. The molar susceptibility χ of the samples was corrected to the effects of the sample holder and diamagnetism and χ* also was corrected to the temperature independent paramagnetic/diamagnetic contribution χ^{TN} and fitted by the Curie-Weiss relation. The values of the Weiss temperature and the effective magnetic moment have been estimated at low and high value of applied magnetic field.
6
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Magnetic Properties of V_{2}O_{3} Nanooxide Prepared Mechanochemically With and Without Salt Matrix

76%
Dvurečenskij A., Billik P., Cigáň A., Bystrický R., Maňka J., Škrátek M., Majerová M.
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vol. 126
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issue 1
398-399
EN
We present a new technological route of synthesis of V_{2}O_{3} nanocrystals based on mechanochemical reduction of V_{2}O_{5} with Na_{2}SO_{3} as a reductant, followed by low temperature vacuum annealing. The structural and magnetic properties of the V_{2}O_{3} nanocrystals were studied.
7
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Superconducting and Magnetic Properties of Sn-Doped EuBa₂Cu₃O_{7-δ} Compound

76%
Dvurečenskij A., Cigáň A., van Driessche I., Škrátek M., Majerová M., Bruneel E., Maňka J.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
1045-1047
EN
Influence of Sn-substitution on structural, superconducting and magnetic properties of EuBa₂Cu₃O_{7-δ} (Eu-123) compound was studied by X-ray diffraction and SQUID magnetic measurements. Transition process from normal to superconducting state and temperature dependences of zero field cooling and field cooling characteristics of magnetic moment and magnetization curves were measured and analysed. Samples of the nominal composition of EuBa₂Cu_{3-x}Sn_xO_{7-δ} with x ranging from 0.0 to 1.5 were prepared by the solid state reaction technique. The increasing Sn-content decreases the volume of the main superconducting phase (Eu-123) and for higher Sn-contents, semiconducting tetragonal Eu₃Ba₃Cu₆O₁₄(Eu-336) and Ba-Sn-O phases are the dominant ones.
8
Content available remote

Magnetic Properties of Synthetic Gehlenite Glass Microspheres

64%
Majerová M., Dvurečenskij A., Cigáň A., Škrátek M., Prnová A., Kraxner J., Galusek D., Maňka J.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
699-701
EN
In the paper, gehlenite amorphous microspheres were prepared by the flame synthesis of a powder precursor. In the first step, the precursor was prepared from a stoichiometric mixture of CaCO₃, Al₂O₃ and SiO₂ by a standard solid-state reaction method. Next, the precursor was sprayed into a CH₄-O₂ flame with the temperature of around 2200°C and molten droplets of synthetic gehlenite were rapidly cooled by distilled water. Structural and detailed magnetic properties were studied by the optical microscopy, X-ray diffraction and QD SQUID magnetometer. The gehlenite microspheres show a complex magnetic behaviour that is a function of the temperature and the magnetic field, e.g. diamagnetism and paramagnetism at 300 K and 2 K, respectively.
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