Soft Li-Ti-Zn ferrites with resistivity &amp;gt; 10&amp;lt;sup&amp;gt;8&amp;lt;/sup&amp;gt;Ω.cm

Simonet, W.; Hermosin, A.

doi:10.1109/tmag.1978.1059933

Cited by 31 publications

(5 citation statements)

References 2 publications

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“…= 0-69 was also used in the calculation of Curie temperatures of these compositions. As depicted in figure 2 the agreement is quite satisfactory with the experimental data of Simonet and Hermosin (1978) and that obtained in the present study. The methods of sample preparation and Curie temperature determination used by us have been reported elsewhere (Pran Kishan et al 1981).…”

Section: Resultssupporting

confidence: 90%

Curie temperatures and 0°K magnetic moments of zinc-substituted lithium ferrites

et al. 1984

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Because of their several attractive features including relatively high Curie temperatures, substituted lithium ferrites have become important for applications at microwave frequencies. N~el collinear arrangement of spins on A and B sublattices is unable to satisfactorily explain the 0°K saturation moments and the observed Curie temperatures of the zinc-substituted lithium ferrites, especially at concentrations of zinc z > 0-3 in the formula Lio.s-~/2 Zn, Fe 2.s _ ,/2 04. Rosencwaig's localized canting model has been extended and used to compute 0 ° K magnetic moments and Curie temperatures of these ferrites with substitution levels up to z = 0-7. Reasonably good agreement between the calculated and experimental values, both for the 0°K magnetic moments and the Curie temperatures, has been obtained using exchange parameters ratios based on the values J, =-20°K, J~-8°K and Jab = J~ =-29OK.

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Section: Resultssupporting

confidence: 90%

Curie temperatures and 0°K magnetic moments of zinc-substituted lithium ferrites

et al. 1984

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“…Usually, lithium ferrite of LiFe50g was prepared by a conventional ceramics techniques [5], with Fe203, Fe(N03h or (CH3COOhFe and Li2C03 as raw materials. The single spinal structure was obtained by calcining in the 800-900•Cfor 0.5-6 hr, then in 1050-110o-Cfor 0.5-2 hr.…”

Section: A Synthesis Of Life508 Nanocrystal Powdersmentioning

confidence: 99%

Synthesis and Microwave Absorptive Properties of Lithium Ferrite Nanocrystals

et al. 1998

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Lithium ferrite nanocrystals were synthesized using polyethylene glycol as a protecting agent for colloidal particles via the sol-gel process. The miCrowave absorbing properties of lithium ferrite nanocrystals were investigated on the frequency range of 8.0-12.4 GHz using an HP-84IOB network analyzer. The results show that the characteristics of lithium ferrite nanocrystals, such as microstructures, grain sizes and scattering states and content in the binders, had great influence on their microwave absorbing properties.

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“…-Taux de substitutions étudiées : zinc (z), titane (t) et manganèse (m). présence de bismuth [24]. L'adjonction de manganèse ' destinée à prévenir la formation de Fe2 +, n'a pas d'influence sur les résultats obtenus compte tenu de la faible valeur de m. Les distributions des cations indiqués par les formules (1), (2) et (3) ont été vérifiées par diffraction de neutrons et de rayons X [9] ; aucun écart significatif n'a été observé.…”

Section: Classificationunclassified

Étude par spectrométrie Mössbauer de ferrites de lithium substitués. Influence des champs hyperfins supertransferrés et de la relaxation

Dormann

1980

Rev. Phys. Appl. (Paris)

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Des séries de ferrites de Li substitués avec du zinc, du titane et du chrome ont été étudiées de 4 à 300 K.Les paramètres hyperfins des différents sites élémentaires de fer ont été déterminés. La variation du champ hyperfin supertransferré 0394HHST due à la substitution de Zn ou de Li en site A, de Ti, de Cr ou de Li en site B a été établie, ainsi que la variation du champ hyperfin du FeB due à la substitution de Cr. Une valeur de 0394HHST(A) plus grande que les valeurs habituelles est trouvée pour la substitution de Ti. Les phénomènes de relaxation usuellement observés dans les ferrites substitués avec du Zn ont été observés pour les ferrites de Li-Zn, mais aussi pour les ferrites de Li-Ti à des taux de substitution et températures plus élevés. Ces phénomènes sont discutés en relation avec la structure non colinéaire des spins des FeB (ferrites de Li-Zn) ou avec celle prévisible des spins des FeA (ferrites de Li-Ti).Abstract. 2014 Several substituted lithium ferrites (with Zn, Ti and Cr) have been studied between 4 and 300 K. The hyperfine parameters of the different sites are deduced. The variation of the supertransferred hyperfine field 0394HSTHF produced by the Zn and Li substitution to the A site Fe and that of the Ti, Li and Cr to the B site Fe is given. The variation of the hyperfine field produced by the Cr substitution to the B site Fe is also given. For Ti substitution the value of 0394HSTHF(A) is found higher than usual values. The same relaxation phenomena as in the case of substituted Zn ferrites are observed in Li-Zn ferrites. The same phenomenum is also observed in Li-Ti ferrites but corresponding to higher substitution and higher temperature. These relaxation phenomena are related to the localized canting of the B site Fe spins existing in Li-Zn ferrites and to the supposed localized canting of the A site Fe spins in the Li-Ti ferrites.

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Soft Li-Ti-Zn ferrites with resistivity > 10<sup>8</sup>Ω.cm

Cited by 31 publications

References 2 publications

Curie temperatures and 0°K magnetic moments of zinc-substituted lithium ferrites

Curie temperatures and 0°K magnetic moments of zinc-substituted lithium ferrites

Synthesis and Microwave Absorptive Properties of Lithium Ferrite Nanocrystals

Étude par spectrométrie Mössbauer de ferrites de lithium substitués. Influence des champs hyperfins supertransferrés et de la relaxation

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