Modified magnetic and dielectric properties in Gd 3+ -substituted lithium zinc ferrite nanocrystallites
| Autor: | Susmita Misra |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Annealing (metallurgy) Magnetism Mechanical Engineering 02 engineering and technology Dielectric Coercivity 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Crystallography Paramagnetism Zinc ferrite Nuclear magnetic resonance Lattice constant Mechanics of Materials 0103 physical sciences General Materials Science Crystallite 0210 nano-technology |
| Zdroj: | Materials Research Bulletin. 91:203-207 |
| ISSN: | 0025-5408 |
| DOI: | 10.1016/j.materresbull.2017.03.039 |
| Popis: | A novel compound Gd 3+ -substituted Li 0.35 Zn 0.3 Gd x Fe 2.35− x O 4 ( x = 0.1) spinel ferrite was successfully synthesized via citrate-gel combustion. XRD patterns confirm formation of single phase compound (with average 15 nm crystallites) after annealing an as-prepared powder at 400 °C for 2 h in air. This sample shows a lower lattice parameter 0.8440 nm as compared to 0.8443 nm in parent compound Li 0.35 Zn 0.3 Fe 2.35 O 4 . Substitution by a paramagnetic ion Gd 3+ → Fe 3+ weakens magnetic super-exchange interactions. Large saturation magnetization M s = 75.56 emu/g (with coercivity H c = 11.55 Oe) in the parent sample is reduced to 51.41 emu/g (with a higher H c = 61.43 Oe) on substitution. Dielectric constant e r of 535 (with a loss tan δ of 2.48) in Li 0.35 Zn 0.3 Fe 2.35 O 4 has dropped to ∼118 (with tan δ = 0.62) in the Li 0.35 Zn 0.3 Gd 0.1 Fe 2.25 O 4 at 1 kHz. Dielectric properties can be explained from polarization effect. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect