1,720,969 research outputs found
Realizzazione di una apparecchiatura per misure di Termoluminescenza in ambito archeometrico
No full textFrustration driven lattice distortions in Li2VOSiO4 and VOMoO4
No full textNMR and EPR measurements in the two-dimensional frustrated anti-ferromagnets on a square lattice Li2VOSiO4 and VOMoO4 are presented. It is found that a structural distortion, possibly driven by the frustration, takes place in both compounds. The modifications induced by the distortion in the NMR and EPR spectra on cooling can be accounted for by a progressive growth of the size of the domains where the lattice is distorted
EPR study of bovine enamel samples from the milk and permanent teeth, normal and fluoridated and X- and beta-ray irradiated: Part 2
No full textElectron paramagnetic resonance in the study of the structure of the hard tissues of teeth
No full textPreparation, structural and magnetic characterisation of RF-sputtered La1-xNaxMnO3 +/-delta thin films manganites
No full textIn this paper we report about the synthesis and characterisation of the structure and magnetic properties of sodium doped LaMnO3 thin films prepared by means of RF-magnetron sputtering. The synthesis was realised at two different substrate temperatures (500 and 700°C) and with different gas chamber compositions. The role of oxygen content variation has been checked by annealing the thin films at different oxygen partial pressures. By reducing the oxygen content an increase of the distortion in the film has been observed together with a reduction of the Curie temperatures. Films with high Curie temperatures (250 K) have been prepared at 700°C in pure argon
Synthesis and characterisation of La1-xNaxMnO3+delta thin films manganites
No full textptimally sodium doped lanthanum manganite (LNMO) thin films have been grown onto differently oriented NdGaO3 single crystals substrates by means of radio-frequency (RF)-magnetron sputtering technique, in order to investigate the role of the strain imposed by lattice mismatch on the magnetotransport properties. Films deposited onto NdGaO3 (I 10) experiment a slight in-plane compressive strain that can be tuned by the thickness and allows to achieve colossal magnetoresistive effects. On the contrary, the change of the substrate orientation induces an in-plane tensile strain, making the film insulating. Above observations are explained by considering the effect of distortions of the Mn-O coordination polyhedra
Preliminary study with electron paramagnetic resonance (EPR) of human dental enamel irradiated with x-, beta- and gamma rays
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