0000000000598789

AUTHOR

N. Sparvieri

showing 2 related works from this author

Thermal diffusivity measurements for Mg-Mn ferrites

1992

Abstract The thermal diffusivity of Mg-Mn ferrites is studied through a modified scheme of the photothermal deflection method able to derive the diffusivity of low-diffusivity samples and to avoid any influence of the vertical offset parameter. The examined samples have been realized under different preparation conditions producing different grain dimensions, and a negligible influence of the grain dimensions is found on the thermal properties.

chemistry.chemical_classificationMaterials sciencechemistryMechanics of MaterialsMechanical EngineeringThermalInorganic chemistryGeneral Materials ScienceComposite materialCondensed Matter PhysicsThermal diffusivityInorganic compoundLaser flash analysisMaterials Letters
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Superconducting properties of polycrystalline YBCO prepared by a pyrolytic process

1994

Polycrystalline YBCO was prepared by a pyrolytic process starting from citrate and tartrate precursors. The effect of the precursor on the superconducting properties was investigated by means of magnetic measurements using a SQUID magnetometer, a Vibrating-Sample Magnetometer and an a.c. susceptometer. The critical temperature is not affected by the type of precursor (Tc=85 K for both). On the other hand, the precursor plays an important role on the critical current density, which is found to be an order of magnitude higher in the sample obtained from citrates (Jc(77K, H=0)=2.3·104 A/cm2 and 103 A/cm2 for the from-citrate and from-tartrate sample, respectively).

SuperconductivityMagnetic measurementsMagnetometerAnalytical chemistryGeneral Physics and AstronomyTartratelaw.inventionchemistry.chemical_compoundNuclear magnetic resonancechemistrylawPyrolytic carbonCrystalliteCritical currentOrder of magnitudeIl Nuovo Cimento D
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