Nanosize effects on the microstructure of BaFe_(10.3)Co_(0.85)Ti_(0.85)O_(19) hexaferrite

摘要

Nanosized and microcrystalline BaFe_(10.3)Co_(0.85)Ti_(0.85)O_(19) samples were investigated by neutron diffraction. A strong anisotropy of the thermal expansion coefficient and its dependence on the grain size was established. The cation distributions and the magnetic moments were determined. The refined magnetic moments proved to be much lower than the theoretical spin only moments, especially for the 4e and 12k sites, indicating a local noncollinearity with short-range ordering.