Evolution of Triplet Paramagnetic Centers in Diamonds Obtained by Sintering of Detonation Nanodiamonds at High Pressure and Temperature
| Autor: | Nikolay N. Efimov, V. Yu. Osipov, S. V. Kidalov, Alexander I. Shames, A. Ya. Vul, V. V. Minin, F. M. Shakhov |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Exchange interaction Detonation Diamond 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Molecular physics Spectral line Electronic Optical and Magnetic Materials law.invention Paramagnetism law Impurity Vacancy defect 0103 physical sciences engineering 0210 nano-technology Electron paramagnetic resonance |
| Zdroj: | Physics of the Solid State. 60:723-729 |
| ISSN: | 1090-6460 1063-7834 |
| Popis: | The electron paramagnetic resonance (EPR) spectra of triplet centers in detonation nanodiamonds (DNDs) and diamond single crystals of submicrometer size, synthesized from those DNDs at high pressures and temperatures, are studied. In the EPR spectra of DNDs, signals from negatively charged nitrogen- vacancy centers (NV)/sup(-) with a g factor of g1 = 4.24 and multivacancies with g2 = 4.00 are observed. The signals from (NV)/sup(-) centers disappear in the spectra of diamond single crystals, and a quintet signal with g = 4.00 is detected at the position of the signal from multivacancies. Analysis of the shape and position of the quintet’ lines showed that this ESR signal is due to the pairs of nitrogen substitution centers in diamond, separated from each other by distances not exceeding 0.7 nm, between which a strong exchange interaction takes place. A comparison of the experimental data and the simulation results allows determining the spin-Hamiltonian parameters of the exchange-coupled pairs of paramagnetic impurity nitrogen atoms. |
| Databáze: | OpenAIRE |
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