TY  - JOUR
AB  - The 39K quadrupole-coupling and chemical-shift tensors have been determined from the angular dependences of the 39K line shifts of the 39K±(1/2 ± 1) / 2 central NMR transitions in the paraelectric (P) and incommensurate (I) phases of K2SeO4. The main effect of the P-I phase transition on these tensors is the appearance of nonzero off-diagonal elements Vab and Vbc which reflects the destruction of mirror planes by frozen-in soft-mode displacements along the b axis. From the angular dependences of the 77Se line shifts the 77Se chemical-shift tensor has been determined in the paraelectric phase of K2SeO4. In contrast to the 39K quadrupole-coupling and chemical-shift tensors it remains unaffected on going through TI and changes only slightly at TC.
DA  - 1988
DO  - 10.1103/PhysRevB.38.8625
LA  - eng
IS  - 13
M2  - 8625
PY  - 1988
SN  - 0163-1829
SP  - 8625-8632
T2  - Physical Review, B
TI  - 39K and 77Se NMR study of the paraelectric-to-incommensurate phase transition of K2SeO4
UR  - https://nbn-resolving.org/urn:nbn:de:0070-pub-17782614
Y2  - 2024-12-25T06:50:47
ER  -