Новый центр ЭПР в прозрачной нанокерамике MgAl2O4

Abstract

The ESR spectra of nanoceramics MgAl2O4 synthesized by the method of thermobaric treatment at different pressures were obtained. In all samples, a wide ESR signal associated with the centers in the initial nanopowder is observed. An increase in pressure leads to the formation of resonance absorption in a field of 3500 Gauss, due to the presence of F+ centers in the sample. The intensity of the specified signal increases with increasing applied pressure. A new ESR signal in a field 3590 Gauss in the samples obtained at 10 GPa was detected. The specified EPR signal presumably associated with the quenching of the orthorhombic phase.