Dielectric response and alternating current conductivity in (Co,Ni)Al2O4 nano-spinel

Tunability of domain structure in partially inverse spinels NiAl2O4

“…The most important claim for NiAl 2 O 4 is its potential application as metamaterial owing to its distinctive dielectric response [ 25 ]. However, its permittivity response to incident AC frequency, Magnetic behavior and polarization & conduction mechanisms are not conclusive [ [26] , [27] , [28] , [29] ]. Such anomalies originate from the cationic distribution within partially-inverse spinel structure [ 12 ] which has an order-disordered face-centered cubic structure with Fd3m space group [ 30 , 31 ].…”

Optical and dielectric properties of silver-substituted ZnAl2O4 spinels synthesized using a sol-gel auto-combustion method

“… 8 The latter are widely used in millimeter-wave telecommunication systems, especially in antennas, dielectric resonators and microwave substrate applications as a consequence of their low dielectric constant, and high-quality factor. 9 Let us recall that, solid-state reaction, 10 sol-gel, 11 co-precipitation, 12 microwave hydrothermal, 13 solvothermal, 14 hydrothermal 15 and combustion methods were commonly used to produce these compounds. 16 Interstingy, doping zinc aluminum with rare earth 17 gives photophysical properties that could be used in upconversion lasers.…”