Synthesis of Cyclic Ether

Banerjee, Ajoy K.; Hurtado, H残tor E.; Laya, Manuel S.

doi:10.3987/r-1983-12-2333

Cited by 37 publications

(48 citation statements)

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“…This is confirmed by the inset of Fig. 3, where we plot H / M against M 2 for T = 240 K: The sign of the slope of the isotherm is negative, which according to the Banerjee criterion, 23 is evidence that the transition is first order. Since we know how the Curie temperature depends on magnetic field, we can estimate the latent heat q for the magnetic transition by making use of the Clapeyron equation:…”

Section: B High-temperature Regionsupporting

confidence: 68%

Magnetic phase transition and electronic transport in single-crystallineLa0.7Ca0.3MnO3

et al. 2008

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The results of measurements of temperature and magnetic-field dependences of magnetization, resistivity, thermopower, and Hall effect in La 0.7 Ca 0.3 MnO 3 single crystal are reported. It is shown that below 220 K, the holes of low mobility dominate conductivity, so that the crystal behaves as a "bad" metal, which is at the threshold of localization at T = 220 K. Above 250 K, La 0.7 Ca 0.3 MnO 3 is in the paramagnetic semiconductor state with the nearest-neighbor hopping conductivity. The ferromagnetic-to-paramagnetic phase transition is first order; the transition heat is about 0.04 kJ/mol. Application of a magnetic field results in the shift of T C toward higher temperatures with the rate dT C / dH Ϸ 0.8 K/kOe. The shift in T C is the driving force for the colossal magnetoresistance ͑CMR͒ effect observed in La 0.7 Ca 0.3 MnO 3 .

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Section: B High-temperature Regionsupporting

confidence: 68%

Magnetic phase transition and electronic transport in single-crystallineLa0.7Ca0.3MnO3

et al. 2008

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“…3͑b͒. According to the Banerjee criterion, 24 a magnetic transition is expected to be of the first order when the slope of M 2 versus H / M plot is negative, whereas it will be of the second order when the slope is positive. It is very clear that the Arrott plot for DyCuAl indicates a characteristic of second-order magnetic transition.…”

Section: Methodsmentioning

confidence: 99%

Large reversible magnetocaloric effect in DyCuAl compound

Dong

Shen

Chen

et al. 2009

Journal of Applied Physics

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Large reversible magnetocaloric effect, which is associated with a second-order magnetic transition at 28 K, has been observed in DyCuAl compound. The maximum values of magnetic entropy change −⌬S M and adiabatic temperature change ⌬T ad are 20.4 J kg −1 K −1 and 7.7 K for a field change of 0-5 T, respectively. Especially, the large values of −⌬S M ͑10.9 J kg −1 K −1 ͒ and ⌬T ad ͑3.6 K͒ with a considerable refrigerant capacity value of 150 J kg −1 are also obtained for a relatively low field change of 0-2 T, suggesting that DyCuAl compound could be considered as a good candidate for low-temperature magnetic refrigerant.

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“…First of all, in order to discard the possibility of a firstorder phase transition we have used the criterion given by Banerjee, 17 who detected the essential similarity between the Landau-Lifshitz 18 and Bean-Rodbell 19 approaches to the problem to give a simple criterion for the identification of first-and second-order magnetic transitions. The criterion consists in inspecting the slope of isotherm plots of H/M vs M 2 .…”

Section: La 1ϫx Srmentioning

confidence: 99%

Critical exponents of the ferromagnetic-paramagnetic phase transition ofLa1−xSrx
Mira
¹
,
Rivas
²
,
Vázquez
³

et al. 1999
Phys. Rev. B
122
1
23
0
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The critical exponents of the second-order ferromagnetic-paramagnetic phase transition of La 1Ϫx Sr x CoO 3 (0.20рxр0.30) compounds are obtained. The results 0.43р␤р0.46, 1.39р␥р1.43, and 4.02р␦р4.38 are qualitatively different than those reported in the literature for parent manganites, and are taken as the indication of the absence of long-range interactions below the Curie point. Electronic phase segregation in hole-rich ferromagnetic and hole-poor LaCoO 3-like regions is supposed to explain the observations. The hole-poor regions would dilute the magnetic lattice and prevent the occurrence of long-range order. Also, a spin transition of the Co 3ϩ ions at T C or the hole-poor regions ͑acting equivalently to missed spin clusters in amorphous ferromagnets͒ could be the reason for the high ␤ value in the framework of a Heisenberg model. ͓S0163-1829͑99͒02801-5͔

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Synthesis of Cyclic Ether

Cited by 37 publications

References 0 publications

Magnetic phase transition and electronic transport in single-crystallineLa0.7Ca0.3MnO3

Magnetic phase transition and electronic transport in single-crystallineLa0.7Ca0.3MnO3

Large reversible magnetocaloric effect in DyCuAl compound

Critical exponents of the ferromagnetic-paramagnetic phase transition ofLa1−xSrx
Mira
¹
,
Rivas
²
,
Vázquez
³

et al. 1999
Phys. Rev. B
122
1
23
0
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Synthesis of Cyclic Ether

Cited by 37 publications

References 0 publications

Magnetic phase transition and electronic transport in single-crystallineLa0.7Ca0.3MnO3

Magnetic phase transition and electronic transport in single-crystallineLa0.7Ca0.3MnO3

Large reversible magnetocaloric effect in DyCuAl compound

Critical exponents of the ferromagnetic-paramagnetic phase transition ofLa1−xSrxMira1, Rivas2, Vázquez3 et al. 1999Phys. Rev. B1221230View full textAdd to dashboardCite

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Critical exponents of the ferromagnetic-paramagnetic phase transition ofLa1−xSrx
Mira
¹
,
Rivas
²
,
Vázquez
³

et al. 1999
Phys. Rev. B
122
1
23
0
View full text Add to dashboard Cite