EPR Spectra of Nitrogen in Ultra-Dispersed Diamonds
Full article
| Common |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Applied Magnetic Resonance
ISSN: 0937-9347
, E-ISSN: 1613-7507
|
| Output data |
Year: 2010,
Volume: 39,
Number: 3,
Pages: 295-302
Pages count
: 8
DOI:
10.1007/s00723-010-0158-4
|
| Tags |
DEFECTS |
| Authors |
Nadolinny V.A.
1
,
Golushko V.V.
1
,
Palyanov Yu.N.
2
,
Shatsky V.S.
2
,
Moseenkov S.I.
3
,
Yuryeva O.P.
1
,
Volodin A.M.
3
|
| Affiliations |
| 1 |
Institute of Inorganic Chemistry
|
| 2 |
Institute of Geology and Mineralogy
|
| 3 |
Institute of Catalysis
|
|
The analysis of the electron paramagnetic resonance (EPR) line shape of ultra-dispersed diamond (UDD) obtained by conversion of trotyl and hexogen mixture and purified from other phases and metal compounds is carried out. The observed wide line with g = 2.0028 and a line width of 8.7 G is shown to be formed by superposition of three lines with line widths of 15.3, 8.5 and 3 G and with a ratio of integral intensities of 70:30:1. The procedure of decomposition and subtraction of wide lines has revealed the resolved hyperfine structure (HFS) from donor nitrogen with parameters A = 40.8 G and B = 29.2 G. Experimentally obtained dependence of the line width of the exchange line on the concentration of donor nitrogen in synthetic diamonds assumed that variations in line widths of the EPR spectrum components are caused by different local concentration of donor nitrogen due to distribution of nitrogen impurity during crystallization of diamond nanoparticles. EPR spectra of UDD after annealing in vacuum and at high pressures in the range of diamond phase stability are also discussed. At high-pressure annealing above 973 K, the areas with high concentration of defects are graphitized and a narrow Dyson-shape line from conductivity electrons and a resolved HFS from donor nitrogen can be observed without additional treatment of the EPR spectrum.