Growth of Sr2Nb2O7 particle size in KCl melts occurs by reaction on insolub
le Nb2O5 particles in the melt. Thus, Sr2Nb2O7 size is controlled by the in
itial size of the reactants. By altering the reactant composition to includ
e larger Nb-rich reactants such as SrNb2O6, 5-30 mu m, anisotropic Sr2Nb2O7
particles are formed.