For pt.I see ibid., vol.15, p.5275 (1982). Nuclear magnetic resonance of 51V (I=7/2) in the tetragonal zircon structure LnVO4 of the lanthanide vanadates is used to measure the nuclear electric quadrupole splitting term P(Iz2- 1/3I(I+1)). Values of mod P/h mod have been determined for all members of the series from Pr3+ to Lu3+ except Pm3+, but including Y3+. The values are found to vary smoothly with the ratio c0/a0, where c0, a 0 are dimensions of the unit crystal cell. A point-charge calculation of the electric field gradient Vzz of the lattice gives general agreement with the experimental result that mod P/h mod diminishes as c 0/a0 increases. From the value Q=-0.052(10) of Childs (1967), the Sternheimer parameter gamma infinity is found to be -12(3) on the basis that P is positive.
