Abstract
Abstract The nuclear spin-lattice relaxation was studied in Bi4Ge3O12 single crystal by 209 Bi NQR. Experimental recovery curves for all 209 Bi NQR transitions of nuclear spin I= 9 2 in the temperature range 10– 230 K were described by the single effective spin-lattice relaxation time T 1 ∗ . The temperature dependence of 1/T 1 ∗ was close to Tn law with n=2.4–2.7. Theoretical treatment was given for the nuclear spin-lattice relaxation in the multi-level system for the case of single-axial crystalline electric field. Both quadrupole and magnetic mechanisms of relaxation were taken into account. It was shown that magnetic mechanism contributes noticeably to the spin-lattice relaxation in Bi4Ge3O12 at T⩽50 K .
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