Synthesis and cation distribution of copper-substituted spinel-related lithium ferrite

Atomistic simulation and ab initio study of the defect structure of spinel-related Li0.5−0.5xMgxFe2.5−0.5xO4

“…The most favourable defect structure models reported in these studies are those which were found to lead to theoretical results which agree with experimental measurements [4,5,[8][9][10][11]. As with other thermally-processed ferrites, the presence of undetected impurities and vacancies as well as the use of different preparation conditions, such as the sintering time and cooling modes, may lead to conflicting defect structure models for lightly cation-doped Li 0.5 Fe 2.5 O 4 .…”

“…Various experimental methods have been used to investigate the defect structure of Li 0.5 Fe 2.5 O 4 doped with various cationic impurities such as Al 3+ , Cr 3+ , Mg 2+ Cu 2+ and Ti 4+ [4,5,[8][9][10][11]. The most favourable defect structure models reported in these studies are those which were found to lead to theoretical results which agree with experimental measurements [4,5,[8][9][10][11].…”

“…At temperatures above 735-755 8C the materials crystallizes in the b-phase which has a similar structure to the a-phase except that the Li + and Fe 3+ ions are randomly distributed over the octahedral B-interstices and the space group is Fd3m [6,7]. The material is extensively studied due to its technologically desirable electric and magnetic properties that are susceptible to modification by introducing suitable cationic substitutes for the Fe 3+ ions at the A-or/and B-sub-lattice and/or by controlling the preparative conditions [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. For instance, as the magnetic moments on the A-and B-sites are antiparallel with the dominant contribution to net magnetisation coming from the Fe 3+ at the octahedral B-sites according to the Né el's collinear model of ferrimagnetism, the magnetic properties of Li 0.5 Fe 2.5 O 4 can be modified by substituting Fe 3+ ions by different magnetic/diamagnetic ions on either or both of the A-and Bsublattices, thus allowing the magnetisation to be tailored for specific applications of the ferrite [1,4,5].…”

Influence of pH on structural morphology and magnetic properties of ordered phase cobalt doped lithium ferrites nanoparticles synthesized by sol–gel method

“…In Li 0.5 Fe 2.5 O 4 , the Li + ions and threefifth of Fe 3+ ions occupy octahedral B sites and the remaining Fe 3+ ions occupy the tetrahedral sites, A [1]. The magnetic moments of each of these sites are anti-parallel and the major contribution to magnetization comes from ions on octahedral sites.…”

Cation distribution of Ni–Cu substituted Li-ferrites

“…Nickel [2,3] and copper [4,5] substituted lithium ferrites are reported to be potential materials for applications at microwave frequencies due to their high resistivities and low losses [2][3][4][5][6][7]. Though there appeared several reports in the literature on the addition of divalent, trivalent and tetravalent ions [8][9] in lithium ferrites to understand the influence of additive ions on electrical and magnetic properties, it seems only very little work has been done so far on the cation distribution of nickel and copper co-substituted lithium ferrites.…”