8 research outputs found
Complex magnetic differentiation of cobalts in NaCoO with 22K N\'eel temperature
Single crystals of sodium cobaltates NaCoO with
were grown by the floating zone technique. Using electrochemical Na
de-intercalation method we reduced the sodium content in the as-grown crystals
down to pure phase with 22 K N\'eel temperature and . The
Co NMR study in the paramagnetic state of the K phase
permitted us to evidence that at least 6 Co sites are differentiated. They
could be separated by their magnetic behaviour into three types: a single site
with cobalt close to non-magnetic Co, two sites with the most magnetic
cobalts in the system, and the remaining three sites displaying an intermediate
behaviour. This unusual magnetic differentiation calls for more detailed NMR
experiments on our well characterized samples.Comment: 5 pages, 4 figures, submitted to JETP Let
Paramagnetic resonance of LaGaO3: Mn single crystals grown by floating zone melting
© 2016, Pleiades Publishing, Ltd. The EPR spectrum of Mn-doped lanthanum gallate single crystals grown by floating zone melting with optical heating has been studied. In contrast to the crystals grown according to the Czochralski method, no manganese is found in these crystals even after high-temperature annealing in air. The spectral characteristics of Fe3+ and Gd3+ centers in crystals prepared by various methods have been compared in the rhombohedral phase, and the fourth-rank nondiagonal parameters of the Fe3+ trigonal centers have been determined, as well
Aproximación integral a la evaluación del progreso hacia la sostenibilidad
Traducción: Patricia M. Bartol de lmbachVersión en inglés disponible en la Biblioteca Digital del IDRC: Community-based indicators : a guide for field workers carrying out monitoring and assessment at the community levelVersión en francés disponible en la Biblioteca Digital del IDRC: Indicateurs communautaires : guide à l'intention des travailleurs sur le terrain faisant des travaux de contrôle et d'évaluation communautaire
Complex magnetic differentiation of cobalts in NaxCoO2 with 22 K Néel temperature
Single crystals of sodium cobaltates NaxCoO2 with x ≈ 0.8 were grown by the floating zone technique. Using electrochemical Na de-intercalation method we reduced the sodium content in the as-grown crystals down to pure phase with 22 K Néel temperature and x ≈ 0.77. The 59Co NMR study in the paramagnetic state of the TN = 22 K phase permitted us to evidence that at least 6 Co sites are differentiated. They could be separated by their magnetic behavior into three types: a single site with cobalt close to non-magnetic Co3+, two sites with the most magnetic cobalts in the system, and the remaining three sites displaying an intermediate behavior. This unusual magnetic differentiation calls for more detailed NMR experiments on our well characterized samples. © 2014 Pleiades Publishing, Inc
Complex magnetic differentiation of cobalts in NaxCoO2 with 22 K Néel temperature
Single crystals of sodium cobaltates NaxCoO2 with x ≈ 0.8 were grown by the floating zone technique. Using electrochemical Na de-intercalation method we reduced the sodium content in the as-grown crystals down to pure phase with 22 K Néel temperature and x ≈ 0.77. The 59Co NMR study in the paramagnetic state of the TN = 22 K phase permitted us to evidence that at least 6 Co sites are differentiated. They could be separated by their magnetic behavior into three types: a single site with cobalt close to non-magnetic Co3+, two sites with the most magnetic cobalts in the system, and the remaining three sites displaying an intermediate behavior. This unusual magnetic differentiation calls for more detailed NMR experiments on our well characterized samples. © 2014 Pleiades Publishing, Inc
Complex magnetic differentiation of cobalts in NaxCoO2 with 22 K Néel temperature
Single crystals of sodium cobaltates NaxCoO2 with x ≈ 0.8 were grown by the floating zone technique. Using electrochemical Na de-intercalation method we reduced the sodium content in the as-grown crystals down to pure phase with 22 K Néel temperature and x ≈ 0.77. The 59Co NMR study in the paramagnetic state of the TN = 22 K phase permitted us to evidence that at least 6 Co sites are differentiated. They could be separated by their magnetic behavior into three types: a single site with cobalt close to non-magnetic Co3+, two sites with the most magnetic cobalts in the system, and the remaining three sites displaying an intermediate behavior. This unusual magnetic differentiation calls for more detailed NMR experiments on our well characterized samples. © 2014 Pleiades Publishing, Inc
Paramagnetic resonance of LaGaO3: Mn single crystals grown by floating zone melting
© 2016, Pleiades Publishing, Ltd. The EPR spectrum of Mn-doped lanthanum gallate single crystals grown by floating zone melting with optical heating has been studied. In contrast to the crystals grown according to the Czochralski method, no manganese is found in these crystals even after high-temperature annealing in air. The spectral characteristics of Fe3+ and Gd3+ centers in crystals prepared by various methods have been compared in the rhombohedral phase, and the fourth-rank nondiagonal parameters of the Fe3+ trigonal centers have been determined, as well