Apparatus for measuring the specific heat of powders at temperatures from 4.3 to 300�K

Yachmenev, V.E.; Movchan, N. P.; Dudnik, E. M.; Kolesnikova, E. A.

doi:10.1007/bf00795805

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(2 citation statements)

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“…The heat capacity (C p ) was measured by the pulse quasi-adiabatic method for the YB 12 tricrystal in the range 2.5-70 K, for the LuB 12 single crystal in the range 0.6-70 K and for the LuB 12 powder sample from 4.3 to 300 K using respectively two types of calorimeter (for compact samples and for the powder one) which have been described in detail in [14,15]. The YB 12 heat capacity below 6 K was measured also in a magnetic field of 1 T assuming the possibility of the superconductive transition in YB 12 at 4.7 K [2].…”

Section: Samples and Experimental Methodsmentioning

confidence: 99%

“…The mass of the LuB 12 powder sample was about 25 g, and the masses of the zone-melted YB 12 and LuB 12 samples were less than 400 mg. The experimental error of the C p study by a copper standard for the calorimeter with the compact samples is less than 1% in the 0.6 ± 70 K range [14]; in the case of the calorimeter for the powder sample the experimental error compared to a leucosapphire standard is equal to 1.46% in the range 4.3 ± 30 K, 0.53% at 30 ± 100 K, and 0.31% at 100 ± 300 K [15].…”

Section: Samples and Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Low-temperature thermal properties of yttrium and lutetium dodecaborides

Czopnik

Shitsevalova

Pluzhnikov

et al. 2005

J. Phys.: Condens. Matter

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The heat capacity (C p ) and dilatation (α) of YB 12 and LuB 12 are studied. C p of the zone-melted YB 12 tricrystal is measured in the range 2.5-70 K, of the zone-melted LuB 12 single crystal in the range 0.6-70 K, and of the LuB 12 powder sample in the range 4.3-300 K; α of the zone-melted YB 12 tricrystal and LuB 12 single crystals is measured in the range 5-200 K. At low temperatures a negative thermal expansion (NTE) is revealed for both compounds: for YB 12 at 50-70 K, for LuB 12 at 10-20 K and 60-130 K. Their high-temperature NTE is a consequence of nearly non-interacting freely oscillating metal ions (Einstein oscillators) in cavities of a simple cubic rigid Debye lattice formed by B 12 cage units. The Einstein temperatures are ∼254 and ∼164 K, and the Debye temperatures are ∼1040 K and ∼1190 K for YB 12 and LuB 12 respectively. The LuB 12 low-temperature NTE is connected with an induced low-energy defect mode. The YB 12 superconducting transition has not been detected up to 2.5 K.

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Section: Samples and Experimental Methodsmentioning

confidence: 99%

Section: Samples and Experimental Methodsmentioning

confidence: 99%