التفاصيل البيبلوغرافية
| العنوان: |
II–VI and II 1- x Mn x VI semiconductor nanocrystals formed by the pressure cycle method. |
| المؤلفون: |
González, J., Contreras, O., Power, Ch., Calderon, E., Quintero, M., Martínez-garcía, D., Muñoz-san Jose, V., Chervin, J.C., Hamel, G., Snoeck, E., Broto, J.M. |
| المصدر: |
High Pressure Research; Jun2005, Vol. 25 Issue 2, p119-135, 17p |
| مصطلحات موضوعية: |
SEMICONDUCTORS, QUANTUM dots, PHASE transitions, NANOCRYSTALS, QUANTUM electronics, PHASE equilibrium, HIGH pressure (Science) |
| مستخلص: |
II–VI and II 1- x Mn x VI nanocrystals were prepared by the pressure cycle method using the Paris–Edinburgh cell. The recovered samples are nanocrystals in the cubic phase zinc-blend (ZB) structure and were characterized using transmission electron microscopy, electron diffraction, X-ray diffraction and Raman scattering. Transmission electron micrographs show that these nanocrystals are nearly spherical with diameters ranging from 20 to 50 nm depending on the sample under investigation. The Raman scattering measurements confirm the existence of II–VI nanocrystals in the cubic phase (ZB). The magnetic properties of Cd 0.5 Mn 0.5 Te nanoparticles were found to vary with the particle size and were different from those observed for the Cd 0.5 Mn 0.5 Te bulk initial samples. The ? vs. T data show temperature hysteresis due to spin-glass form, which occurs at T g =21 K, for both the bulk as well as for the recovered nanoparticle samples. The zero-field cooled and field-cooled ? vs. T curves for the nanoparticles showed a monotonous increase below T g . Below ~21 K, the M vs. B curve for the recovered nanoparticle samples exhibited magnetic hysteresis, and this is attributed to a weak ferromagnetic contribution. This contribution is also observed in the ?( T ) curves and is due to a large surface/volume ratio of the nanoparticles, which enhances the magnetic interaction. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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