The heat capacities of seven rare-earth ethylsulphates at low temperature

Meyer, Horst; Smith, P. L.

doi:10.1016/0022-3697(59)90105-2

Cited by 70 publications

(9 citation statements)

References 13 publications

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“…Data on the interesting Schottky transformations in the lanthanide hydrated ethyl sulfates by Meyer and his collaborators (89,138,140) are suggestive and of considerable interest, but they do not cover a sufficiently extended range to permit entropy calculations. Vapor pressure data of metallically bonded lanthanide-magnesium alloys have been used also to deduce enthalpies of formation of CsCl-type compounds.…”

Section: Miscellaneous Materialsmentioning

confidence: 96%

Developments in Chemical Thermodynamics of the Lanthanides

Westrum

1967

Lanthanide/Actinide Chemistry

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Section: Miscellaneous Materialsmentioning

confidence: 96%

Developments in Chemical Thermodynamics of the Lanthanides

Westrum

1967

Lanthanide/Actinide Chemistry

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“…The electron spin resonance measurements of Bogle et al (1951) indicated that the I++) doublet lies lowest with the I + : ) doublet lying next at (3 i. 1) cm-; the 1 i ) level is believed by Elliott and Stevens to be at about 130 cm-However, Bogle's measurements of the susceptibility of this salt showed that the 1 $ ) level appeared lowest with the k i ) level at 5 cm-'; this value for the separation was confirmed by the specific heat measurements of Meyer and Smith (1959) and the later susceptibility measurements of van den Broek and van der Mare1 (1963). The apparent contradiction between the resonance and the susceptibility-specific heat measurements is removed when it is remembered that the latter measurements were performed on the undiluted salt while the resonance measurements, in order to reduce the line broadening by dipole-dipole interactions between the cerium ions, were made on the salt diluted with 99.5 of lanthanum ethyl sulphate.…”

Section: Introductionmentioning

confidence: 70%

Possible Existence of a Transient Superfluid Plasma in Liquid Helium II

Minami¹,

Kato²,

Amin³

et al. 1992

jjap

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Magnetic susceptibility measurements have been made between 4.2 and 1.1 K on single crystals of cerium ethyl sulphate diluted with various amounts of lanthanum ethyl sulphate. It has been observed that the splitting between the ground and first excited levels of the Ce3+ ion varies with the degree of dilution, the levels actually inverting. This is attributed to the change in the crystal field, and a group theory argument is given for a simple model to show that such an inversion of the levels is permissible.

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“…Specific heat of PrES as a function of temperature: 0 present work, 0 Meyer and Smith (1959). The addenda, lattice and upper singlet state contributions have been subtracted.…”

Section: Specific Heatmentioning

confidence: 99%

“…The lattice contribution was assumed the same as that for LaES, that is C / R = 0.75 x T 3 (Onn et al 1965). Furthermore PrES exhibits a Schottky specific heat anomaly at about 8 K due to the singlet at 16.7 K above the ground state doublet (Meyer and Smith 1959). This anomaly has a low-temperature tail, given by C / R = 0.5 (16.7/T)2 exp ( -16.7/7'), which is negligible below 1 K and contributes about 4% of the total specific heat at 1.5 K. Thus, the data in figure 1 represent the specific heat anomaly arising only from the ground state non-Kramers doublet.…”

Section: Specific Heatmentioning

confidence: 99%

Electron Swarm Parameters in SF₆and Krypton Gas Mixtures

Xiao¹,

Zhu²,

Li³

2001

Jpn. J. Appl. Phys.

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Specific heat and electric susceptibility measurements on praseodymium ethyl sulphate have shown that down to 0.06 K it IS well described by the one-dimensional X Y model with the interaction between nearest neighbour pairs of praseodymium ions arising from electric dipole-dipole coupling. A comparison of the experimental data and the theoretical expression for electric susceptibility gives the nearest neighbour pair interaction parameter, J , equal to k , x 0 7 6 K. The electric dipole moment of the Pr3+ ion was found to be confined to the XYplane and was ofmagnitude y = 7.8 x C m; the consequent electric dipole-dipole interaction parameter between nearest neighbours was k , x 1.12 K, in reasonably good agreement with the J-value determined from electric susceptibility. Both the dipole moment and the low-temperature ordering are interpreted as Jahn-Teller effects. The thermal conductivity shows strong resonant scattering of the acoustic phonons; this is interpreted to be the result of an interaction between the phonons and the elementary excitations of a one-dimensional X Y chain. The resonance energy of k, x (078 & 0.03)K is in excellent agreement with the predicted low-wavevector elementary excitation energy J. The results and interpretation of the various experiments on PrES are compared with the earlier work on praseodymium chloride which showed both one-dimensional and three-dimensional antiferroelectric ordering.

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The heat capacities of seven rare-earth ethylsulphates at low temperature

Cited by 70 publications

References 13 publications

Developments in Chemical Thermodynamics of the Lanthanides

Developments in Chemical Thermodynamics of the Lanthanides

Possible Existence of a Transient Superfluid Plasma in Liquid Helium II

Electron Swarm Parameters in SF₆and Krypton Gas Mixtures

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The heat capacities of seven rare-earth ethylsulphates at low temperature

Cited by 70 publications

References 13 publications

Developments in Chemical Thermodynamics of the Lanthanides

Developments in Chemical Thermodynamics of the Lanthanides

Possible Existence of a Transient Superfluid Plasma in Liquid Helium II

Electron Swarm Parameters in SF6and Krypton Gas Mixtures

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Product

Resources

About

Electron Swarm Parameters in SF₆and Krypton Gas Mixtures