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Zero-field splittings of NQR spectra for bismuth(III) oxy compounds revealed by quadrupole spin echo envelopes

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Abstract

Local magnetic fields up to 250 G were earlier found by measuring the NQI parameters in bismuth(III) oxy compounds conventionally considered as diamagnets, a strong increase in the 209Bi line intensities being observed in external magnetic fields. An approach based on registration of the quadrupole spin-echo envelopes enabled to reveal small (within an inhomogeneous line broadening) splittings in some other compounds of this type. The modeling of time dependence of the quadrupole spin echo amplitude indicated that modulations of the spin echo envelope in BaBiO2Cl and Bi3B5O12 resulted from weak (≤5 G) local magnetic fields. By using this approach, it was found that an increase in the 209Bi resonance intensity in external magnetic fields is related to an influence of the fields on the nuclear spin-spin relaxation rate for the appropriate compounds.

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Correspondence to E. A. Kravchenko.

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Kravchenko, E.A., Orlov, V.G., Morgunov, V.G. et al. Zero-field splittings of NQR spectra for bismuth(III) oxy compounds revealed by quadrupole spin echo envelopes. Hyperfine Interact 180, 7–10 (2007). https://doi.org/10.1007/s10751-008-9623-y

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