A Mössbauer Study of Jahn-TelIer Cryntal Distortion in Copper-Ferrite

Yamadaya, T.; Mitui, Tadayasu; Okada, Takuya; Shikazono, Naoya; Hamaguchi, Yoshikazu

doi:10.1143/jpsj.17.1897

Cited by 22 publications

(2 citation statements)

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“…Thermal treatment of the tetragonal form causes a decrease in quadrupole splitting at about 363 K as it changes to the cubic form [92]. Thermal treatment of the tetragonal form causes a decrease in quadrupole splitting at about 363 K as it changes to the cubic form [92].…”

Section: Cuiife~ii04 and Related Phasesmentioning

confidence: 99%

Iron Oxides and Sulphides

Greenwood

Gibb

1971

Mössbauer Spectroscopy

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Section: Cuiife~ii04 and Related Phasesmentioning

confidence: 99%

Iron Oxides and Sulphides

Greenwood

Gibb

1971

Mössbauer Spectroscopy

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“…From the applications' point of view, the components made-up of ferrite spinels have peculiar importance in the microwave sensors/actuators, magnetic filters, transformer cores, and magnetic switches [7][8][9][10][11][12][13]. On the other hand, the fundamental physical properties of ferrite spinels are of great interest to the scientific community because they exhibit tunable magnetic properties mainly driven by the cationic distribution and structure dependent magnetic ordering [14,15].…”

Section: Introductionmentioning

confidence: 99%

The role of Zn and Ru substitution on the structural, magnetic and dielectric properties of ferrite cuprospinels

Roy-Chowdhury,

Jena,

Khadse

et al. 2023

J. Phys. D: Appl. Phys.

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A comprehensive study on the structural, magnetic and dielectric behavior of ferrite cuprospinels with site specific substitution of non-magnetic Zn and weakly magnetic Ru ions has been presented. Such substitution leads to two classes of stable crystal symmetries (i) Tetragonal (I41/amd): CuFe1.95Ru0.05O4 and Cu0.95Zn0.05Fe1.95Ru0.05O4 and (ii) Cubic (Fd-3m): Cu0.60Zn0.40Fe1.95Ru0.05O4 and Cu0.05Zn0.95Fe1.95Ru0.05O4 bulk polycrystals. The former set of compounds undergo significant Jahn-Teller (JT) distortion due to high Cu content and such distortion gets lifted with the substitution of non-magnetic Zn ions. Ferrimagnetic (FiM) behavior is predominant in all these compounds except the highest Zn (95 at%) content cubic system with diluted substitution of Ru (2.5 at%) which exhibits antiferromagnetic (AFM) ordering below the Néel temperature (TN ~ 10.9 K). We employed Néel’s expression for FiM systems applicable for the two sublattice model to extract the dominant exchange interactions (JAA, JAB and JBB) between the A-site and B-site cations. For the tetragonally distorted Zn diluted system exhibits JAA/kB ~391 K with very high asymptotic Curie temperature, while the Zn-rich cubic system exhibits JAA/kB ~ 300 K. On the other hand, the tetragonally distorted spinel devoid of Zn exhibits dominant JBB/kB ~ 229 K with negligible JAA/kB and moderate JAB/kB (65 K) signifying that the JT active ions cause the onset of magnetic frustration and enhanced ordering temperatures. The ac-resistivity ρ(f,T) studies reveal that the mode of conduction follows Mott’s variable-range hopping (VRH) model with a linear logarithmic variation of ρac versus T-0.25. The temperature dependence of the VRH activation energy (24.5 meV ≤ Ea-VRH ≤ 67 meV at T = 50 K and 94 meV ≤ Ea-VRH ≤ 257 meV at T = 300 K) of charge carriers follows a linear behavior which indicates the presence of localized polaron in all the investigated systems.

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A Mössbauer Study of the pair effects in the system Zn(Mn1–xFex)2O4

Gérard

Wautelet

1973

Phys. Stat. Sol. (a)

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Pair effects have been observed by Mössbauer spectroscopy in the system Zn(Mn1–xFex)2O4, for x in the range 0.02 to 0.30. An appropriate sintering gave normal ZnMn2O4. The spectra depend upon x and show that the quadrupole splittings of (1.44 ± 0.06) and (0.50 ± 0.06) mm/s may be associated with isolated and paired Fe3+, respectively. The relative intensities of the lines also vary with x according to the binomial law. These results permit to understand the quadrupole splittings observed in the case of CuFe2O4. It is found from Mössbauer spectra that the Néel temperature of ZnMn2O4 lies around 50°K, well below the previously reported range of 200 to 250°K.

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A Mössbauer Study of Jahn-TelIer Cryntal Distortion in Copper-Ferrite

Cited by 22 publications

References 1 publication

Iron Oxides and Sulphides

Iron Oxides and Sulphides

The role of Zn and Ru substitution on the structural, magnetic and dielectric properties of ferrite cuprospinels

A Mössbauer Study of the pair effects in the system Zn(Mn1–xFex)2O4

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