  We report a comprehensive study of dc susceptibility, specific heat, neutron
diffraction, and inelastic neutron scattering measurements on polycrystalline
Ba3(Cr1-xVx)2O8 samples, where x=0, 0.06, 0.15, and 0.53. A Jahn-Teller
structure transition occurs for x=0, 0.06, and 0.15 samples and the transition
temperature is reduced upon vanadium substitution from 70(2) K at x=0 to 60(2)
K at x=0.06 and 0.15. The structure becomes less distorted as x increases and
such transition disappears at x=0.53. The observed magnetic excitation spectrum
indicates that the singlet ground state remains unaltered and spin gap energy
\Delta=1.3(1) meV is identical within the instrument resolution for all x. In
addition, the dispersion bandwidth W decreases with increase of x. At x=0.53, W
is reduced to 1.4(1) meV from 2.0(1) meV at x=0.
