Preparation and X-Ray diffraction, dielectric, and Mössbauer characterization of CoCuCrO ceramics.

CoCuCrO (0 ≤ x ≤ 1) ceramic samples have been characterized by room-temperature X-ray diffraction and relative dielectric permittivity ɛ( T) and loss tangent tanδ( T) measurements (at frequencies from 0.1 to 200 kHz) in the range 100-350 K. The samples were shown to consist of spinel solid solutions with a cubic (0 < x < 0.53) or tetragonal (0.53 < x < 1) structure. Increasing the Cu content of the samples increases their tanδ and electrical conductivity and produces anomalies in the temperature dependences ɛ( T) and tanδ( T) due to dielectric relaxation processes. CoCuCrO:0.01FeO samples were characterized by Mössbauer spectroscopy in the range 77-290 K and shown to be in a magnetically ordered state at 77 K. [ABSTRACT FROM AUTHOR]