Study of the EFG tensor at 75As nuclei in Ge-As-Se chalcogenide glasses.
Asymmetry parameters of the electric field gradient tensor at (75) As nuclei were determined for chalcogenide glassy semiconductors (CGS) of the Ge-As-Se system by comparing the experimental and simulated (75) As nuclear quadrupole resonance nutation interferograms. The electric field gradient asymmetry in CGS was analyzed, and it is believed that a structural change in these glassy semiconductors takes place at r¯ =  2.425. Electron paramagnetic resonance spectra of the Ge-As-Se system were obtained for the first time. A comparison was made between the results of analysis of the Ge-As-Se system by nuclear quadrupole resonance and electron paramagnetic resonance methods, and this allowed us to make the supposition that a structural phase transition occurs at r¯ = 2.4 from two-dimensional to three-dimensional CGS structure.
Laboratory of Magnetic Resonance, Institute of Physics and Technology, Immanuel Kant Baltic Federal University, A. Nevski 14, 236041, Kaliningrad, Russia.
O N
ON
Bolebrukh
N Ya
NY
Sinyavsky
B
B
Dobosz
I P
IP
Korneva
R
R
Krzyminiewski
M
M
Ostafin
B
B
Nogaj
D001151:Arsenic / Q000737:chemistry*; D004574:Electromagnetic Fields; D004578:Electron Spin Resonance Spectroscopy; D005857:Germanium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D012643:Selenium / Q000737:chemistry*
D005857:Germanium; D012643:Selenium; D001151:Arsenic
asymmetry parameter; electron paramagnetic resonance spectroscopy (EPR); geometric phase (Berry phase); glassy semiconductors; nuclear quadrupole resonance spectroscopy