Magnetic properties of copper ferrite aluminates

Inter-diffusion between NiCuZn-ferrite and LTCC and its influence on magnetic performance

“…Additionally, the presence of non-magnetic Al 3+ ions produced a weaker super-exchange force and consequently, a lower saturation magnetization. 20 The crystal structure of ␣-Fe 2 O 3 is the same as that of ␣-Al 2 O 3 . Some studies suggested that the solid solution between ␣-Fe 2 O 3 and ␣-Al 2 O 3 is possible above 1200 • C. 21,22 The Al 3+ ions tend to substitute Fe 3+ in B sites as demonstrated in the following reaction.…”

“…Some studies also indicated that the co-firing of ferrite and Al 2 O 3 may produce ferrite-aluminate at temperatures above 1000 • C. [23][24][25] The aluminate is not found in the sintered powder compacts; because all ingredients are mixed together in the power compacts, this absence suggests that the formation of aluminate is highly unlikely for the systems used. On the other hand, since the size of Al ions is small, the substitution of Fe ion with Al ions significantly reduced spinel crystal size.…”

Negative magnetization, magnetic anisotropy and magnetic ordering studies on Al3+-substituted copper ferrite

“…To our knowledge few research reports are available on various physical properties of CuAl x Fe 2−x O 4 spinel ferrite system including our recent work on the system [21,25,26,30,32,[48][49][50][51].…”

Role of Cu2+ concentration on the structure and transport properties of Cr–Zn ferrites

“…Copper ferrite shows variation in its magnetic properties depending on the thermal history of the preparation [3,4] which is attributed to the distribution of Cu 2+ and Fe 3+ among the two non-equivalent sites, tetrahedral (A) and octahedral (B), provided by the spinel structure.…”