  Single crystals of (Eu$_{1-x}$Ba$_x$)O have been grown in a molten
barium-magnesium metal flux at temperatures up to 1000{\deg}C, producing single
crystals of (Eu$_{1-x}$Ba$_x$)O with barium doping levels ranging from $x=0.03$
to $x=0.25$. Magnetic measurements show that the ferromagnetic Curie
temperature T$_C$ correlates with the Ba doping levels, and a modified
Heisenberg model was used to describe the stoichiometry dependence of T$_C$.
Extrapolation of the results indicates that a sample with Ba concentration of
$x=0.72$ should have a T$_C$ of 0 K, potentially producing a quantum phase
transition in this material.
