Some AC electrical properties of Li-Mg ferrites[Alternating Current]

Journal Article · Sat May 01 04:00:00 EDT 1999 · Materials Research Bulletin

DOI:https://doi.org/10.1016/S0025-5408(99)00107-5· OSTI ID:20005950

Bellad, S S; Watawe, S C; Chougule, B K

The ac resistivity ({rho}{sub ac}), dielectric constant ({epsilon}{prime}), dielectric loss tangent (tan {delta}) and initial permeability ({mu}{sub i}) of mixed Li{sub 0.5{minus}x/2}Mg{sub x}Fe{sub 2.5{minus}x/2}O{sub 4} (where x = 0.1, 0.2, 0.3, 0.4, 0.5, and 0.6) ferrite system were measured at room temperature as a function of frequency in the range from 1 kHz to 1 MHz. The resistivity of all the samples decreased with increase in frequency, indicating that the samples exhibited normal ferrimagnetic behavior. The compositional variation of resistivity and dielectric constant indicated the inverse trends of each other. The sample with x = 0.3 showed the lowest resistivity and the highest dielectric constant. The dielectric loss tangent showed maxima at 3 kHz for x = 0.2 samples and at 15--20 kHz for x = 0.3 and 0.4 samples. All of the variations are explained on the basis of Fe{sup 2+}/Fe{sup 3+} ion concentration on octahedral sites as well as the electronic hopping frequency between Fe{sup 2+} {leftrightarrow} Fe{sup 3+} ions.

• Research Organization: Shivaji Univ., Kolhapur (IN)
• OSTI ID: 20005950
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 7 Vol. 34; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHEMICAL COMPOSITION
ELECTRICAL PROPERTIES
FERRIMAGNETIC MATERIALS
FREQUENCY DEPENDENCE
IRON OXIDES
LITHIUM OXIDES
MAGNESIUM OXIDES
X-RAY DIFFRACTION