Date of Award
Master of Science (MS)
Professor C. V. Stager
The nuclear magnetic resonance spectrum of the ⁵¹V nucleus in DyVO₄ has been investigated in order to determine if the crystal undergoes any crystallographic distortion or symmetry reduction down to liquid nitrogen temperature, T=77ºK. It has been found, using the effects of the electric quadrupole interaction at the vanadium nucleus, that no such distortion or symmetry alteration could be detected down to T=77ºK. Although it is known that the crystal undergoes a spontaneous second-order crystallographic phase transition, via the cooperative Jahn-Teller effect to a state of lower symmetry at a temperature TD=14ºK and that it undergoes a second transition to an antiferro-magnetic state at TN=3.04ºK, these phenomena were unfortunately unable to be observed due to technical difficulties. However, the existence and effects of the electric quadrupole interaction in DyVO₄ at T=77ºK and T=292ºK have been established, and speculation has been made as to the possible findings in the very low temperature range between 2ºK and 15ºK.
Jeeves, William Patrick, "The Investigation of the Temperature Dependence of the NMR Spectrum of ⁵¹V in DyVO₄ by Study of its Electric Quadrupole Interaction Induced Angular Variation at T=77ºK and T=292ºK" (1975). Open Access Dissertations and Theses. Paper 471.