Paramagnetic copper centers in ferroelectric lead germanate with halogens

Hyperfine structure of EPR spectra of Gd3+ odd isotopes in PbMoO4, Pb5Ge3O11, YVO4, and quadrupole interaction (temperature dependence)

“…For Pb 5 Ge 3 O 11 , all measurements were per formed in the ferroelectric phase, far from the phase transition temperature, where the crystal structure reconstructs. Parameters that we obtained coin cide with the results of [8] for PbMoO 4 (T = 300 K), [9] for YVO 4 (T = 4.2, 298 K), and [7] for Pb 5 Ge 3 O 11 (T = 100-300 K) accurate to the measurement error.…”

“…All notations in expressions (1) and (2) are stan dard [1], and the double sign in (2) is associated with domain splitting [7].…”