Magnetic and thermodynamic properties of the thiospinel compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi><mml:mi mathvariant="normal">Cr</mml:mi><mml:mi mathvariant="normal">Zr</mml:mi><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Ito, Masakazu; Yamamoto, Hiroki; Nagata, Satoshi; Suzuki, Takashi

doi:10.1103/physrevb.74.214412

Cited by 15 publications

(3 citation statements)

References 37 publications

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“…In addition, if o ‐Ps had formed within the CB filler, the o ‐Ps lifetime would have changed with CB loading. However, since this was not observed, it can be inferred that o ‐Ps is indeed not formed in CB, a conclusion in agreement with earlier studies on the quenching of Ps by carbon allotropes 82,83 …”

Section: Resultssupporting

confidence: 91%

Free volume in carbon‐black‐filled isoprene rubber investigated by positron annihilation lifetime spectroscopy

Chiari

Nippa

Ikeda

et al. 2022

J of Applied Polymer Sci

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The free volume in the amorphous phase of a simple carbon‐black‐filled peroxide cross‐linked isoprene rubber (IR) is investigated by positron annihilation lifetime spectroscopy to clarify the structural changes in the rubber phase by the carbon black (CB) fillers. The ortho‐positronium (o‐Ps) pick‐off annihilation lifetime measured in the rubber without CB is around 2.8 ns and is found to be almost constant even after CB filling. This result indicates that in a portion of the rubber phase the free volume remains similar in size to that in the cross‐linked IR without CB. The o‐Ps intensity drastically decreases from 37% without CB to 15% with a CB loading as high as 80 phr. This decline is revealed to exceed the contribution, which is expected only from the decrease in the fraction of the amorphous phase by CB addition, by a factor of 0.37 at the highest CB loading. The additional reduction is related to the generation of a bound rubber layer surrounding the CB fillers with low molecular‐chain mobility where positronium formation is inhibited. The decrease rate is found to represent the volume of this rigid rubber phase and strongly depend on the formation of the CB network structure.

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Section: Resultssupporting

confidence: 91%

Free volume in carbon‐black‐filled isoprene rubber investigated by positron annihilation lifetime spectroscopy

Chiari

Nippa

Ikeda

et al. 2022

J of Applied Polymer Sci

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“…As is well known, C P ͑T͒ of the spin-glass system does not have discontinuity. [13][14][15] Judging from the magnetic and thermodynamic properties, the anomalies of M͑T͒ / H at T f1 and T f2 may be caused by the spin-glass freezing.…”

Section: A Spin-glass Behavior At Low Temperaturementioning

confidence: 99%

Low-temperature magnetic properties of Heusler compoundsRu2−xFexCrSi<

et al. 2010

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We carried out magnetization M͑T͒ and specific-heat C P ͑T͒ measurements of the new Heusler compounds Ru 2−x Fe x CrSi ͑x = 0.1, 0.3, and 0.5͒, which exhibit spin-glass freezing. M͑T͒ has peak-and irreversibilitytype anomalies. The temperatures at which these anomalies appear have magnetic field dependence described by the Gabay-Toulouse and de Almeida-Thouless lines in the low-field range. For the magnetic specific heat C m ͑T͒, we did not observe a discontinuity indicating long-range magnetic phase transition but a broad hump characteristic of spin-glass freezing. C m ͑T͒ in the low-temperature range is described as a combination of linear-and quadratic-T terms. The quadratic-T dependence of C m ͑T͒ is probably associated with excitation of the Ising component of the freezing spins.

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“…Two different magnetic phases with different magnetoelastic couplings on the chromium spinel ZnCr 2 S 4 are interesting because of the presence of the strong competition between ferromagnetic and antiferromagnetic exchange of nearly equal strength, yielding strong bond frustration. [6][7][8][9] This is due to enhanced A-A and B-B interactions, which is resulting from the weakened A-B interaction of the spinels. 5 If Zn ions are substituted with Fe ions of FeCr 2 S 4 , ferromagnetic Cr-Cr exchanges start changing to antiferromagnetic Cr-Cr exchanges.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer studies of the magnetic phase transition in Fe1−xZnxCr2S4

Bae

Kim

2008

Journal of Applied Physics

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The polycrystalline samples of Zn-doped Fe1−xZnxCr2S4 (0.1⩽x⩽0.9) have been studied with x-ray diffraction, magnetization, and Mössbauer spectra measurements. Magnetic structure transforms from the ferromagnetic (0.1⩽x⩽0.5) to the antiferromagnetic phase (0.7⩽x⩽0.9). The Mössbauer spectra of Fe1−xZnxCr2S4 show asymmetrical eight lines due to electric quadrupole interactions below 10K. The magnetic hyperfine field and electric quadrupole interaction for the sample x=0.5 at 4.2K have been fitted with Mössbauer hyperfine parameters of Hhf=116kOe, θ=27°, φ=0°, η=0.60, EQ=2.28mm∕s, and R=2.9. We have observed that the magnetic hyperfine field Hhf decreases with increasing Zn concentration in the ferrimagnetic range (0.1⩽x⩽0.5) at 4.2K, while it increases in the antiferromagnetic region (0.7⩽x⩽0.9). This indicates the changes in the orbital current field contribution depending on Zn concentration in Fe1−xZnxCr2S4.

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Magnetic and thermodynamic properties of the thiospinel compoundCuCrZrS4

Cited by 15 publications

References 37 publications

Free volume in carbon‐black‐filled isoprene rubber investigated by positron annihilation lifetime spectroscopy

Free volume in carbon‐black‐filled isoprene rubber investigated by positron annihilation lifetime spectroscopy

Low-temperature magnetic properties of Heusler compoundsRu2−xFexCrSi<

Mössbauer studies of the magnetic phase transition in Fe1−xZnxCr2S4

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