Thermal expansion of Ti-substituted barium hexaferrite

Abstract

Thermal expansion measurements in the range of 20-500°C were carried out on both poly- and single crystalline samples of the hexagonal magnetoplumbite ferrite with composition BaTiFe11O19. The continuous scanning of the thermal expansion reveals the existence of a λ-type anomaly near the Curie temperature. In contrast to the usual observed anisotropic behavior for magnetoplumbite hexaferrites, the averaged thermal expansion coefficient for the a direction is larger than for the c direction, i.e., 12.8×10-6 and 9.5×10-6°C-1, respectively. © 2000 American Institute of Physics.