  Vanadium substituted SrM hexaferrites (SrFe12-xVxO19 with x = 0.2, 0.4) and
Eu-substituted BaM hexaferrite (Ba0.8Eu0.2Fe12O19) were prepared by high energy
ball milling and sintering at 1200{\deg} C. X-ray diffraction measurements
revealed that the V-substituted SrM samples exhibited phase separation
resulting in the coexistence of the pure SrM magnetic phase with nonmagnetic
Sr3(VO4)2 vanadate and {\alpha}-Fe2O3 iron oxide phase. Also, the
Eu-substituted BaM hexaferrite revealed the formation of the pure BaM phase
coexisting with {\alpha}-Fe2O3 secondary phase, and Eu-garnet minor phase.
Although the magnetic properties of the samples deteriorated with respect to
pure hexaferrite properties, the magnetic parameters of the substituted samples
were found to be of potential importance for practical applications. Further,
the results of the study suggest methods for the preparation of high quality
SrM hexaferrites, and hexaferrite/garnet composites.
