Hts Logo

NIST High Temp. Superconducting Materials (HTS) Database:

NIST Standard Reference Database 62

Last Update to Data Content: 1996

DOI: https://doi.org/10.18434/T4KP8J

Bibliographic Information

Title: Thermal Conductivity of Polycrystalline YBa2Cu4O8
Author(s): B.M. Andersson, B. Sundqvist, J. Niska, and B. Loberg
Publication: Physical Review B Volume: 49 Issue: 6 Year: 1994 Page(s): 4189-4198
Editor(s): Not Available
Publisher: American Physical Society
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Temperature, Resistivity (normal state), Thermal Conductivity, Thermal Diffusivity

Materials and Properties

Y:124; [Y-Ba-Cu-O]
Material Specification for Y:124; [Y-Ba-Cu-O] Process: Hot Isostatic Pressing
Notes: The authors cite J. Niska et al., J. Mater. Sci. Lett., Vol. 9, 770 (1990), and summarize the procedure as follows. "Dense bulk polycrystalline ceramic material was produced by hot isostatic pressing (HIPing) a mixture of CuO and 1:2:3 powders in Ar, using a glass container to avoid losing oxygen... For the measurements of k, a rod with dimensions 0.7x0.9x13.8 mm3 was therefore cut along the axis of the cylinder where the homogeneity was best."
Formula: YBa2Cu4O8
Informal Name: Y:124
Chemical Family: Y-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Temperature for Y:124; [Y-Ba-Cu-O]
Tc(Onset) (K) Transition Width, ΔTc () Critical Temperature (K)
79 4 75
Measurement Method: Resistivity method
The authors cite B.M. Andersson et al., Physica C, Vol. 170, 521 (1990). No additional measurement details were noted.

Cautions: Unevaluated Data
Resistivity (normal state) for Y:124; [Y-Ba-Cu-O]
Temperature (K) Resistivity (normal state) (mΩ·cm)
75 0.01
78 0.12
80 0.19
99 0.23
144 0.32
206 0.45
293 0.62
Measurement Method: Resistivity method
The authors cite B.M. Andersson et al., Physica C, Vol. 170, 521 (1990). No additional measurement details were noted.

Cautions: Unevaluated Data
Digitized data were obtained from Figure 1 of the paper.
Thermal Conductivity for Y:124; [Y-Ba-Cu-O]
Temperature (K) Thermal Conductivity (W m-1 K-1)
30 5.2
41 8.3
50 10.0
60 10.1
71 9.8
80 9.2
92 9.0
99 8.9
111 8.6
119 8.4
130 8.3
145 8.1
161 7.6
185 7.3
187 6.8
223 6.7
233 6.8
263 6.3
286 6.5
283 6.0
299 6.0
Measurement Method: Thermal transport methods
The authors cite Compendium of Thermophysical Property Measurement Methods, edited by K.D. Maglic, A. Cezairliyan, and V.E. Peletsky, Plenum, New York (1984), and summarize the procedure as follows. "Below 160 K we measured k by the standard longitudinal steady-state method. However, in this method thermal radiation can lead to serious overestimates of k at high T... above 70 K we... used instead the standard version of Angstrom's temperature wave method, which, in principle, eliminates heat-loss effects. This method actually measures the thermal diffusivity β, but k can be found from k = βdc

, where c

is the specific-heat capacity. All measurements were carried out in a vacuum of about 2 x 10-5 mbar... The sample was provided with a heater in one end and was attached at the other to a copper heat sink to which all wires were thermally anchored, and which could be screwed to the inside of a Cu chamber in the cryostat. In the steady-state method, k was measured over a distance of 5.3 mm on the sample using calibrated type-K thermocouples, 50 µm in diameter. The heater power was calculated from measured currents and voltages, and the data were corrected for Joule heating in, and heat conduction along, connecting wires. ... The thermal diffusivity β was measured using Angstrom's method, i.e., calculating a from the attenuation and phase shift of a temperature wave between two points on the sample. In this experiment the two points were separated by about 1 mm, the signal period was in the range 4-30 s..."

Cautions: Evaluated Data
Digitized data were obtained from Figure 5 of the paper.

Thermal Diffusivity for Y:124; [Y-Ba-Cu-O]
Temperature (K) Thermal Diffusivity (10-6 m2 s-1)
68 0.117
102 0.065
150 0.042
203 0.031
250 0.026
297 0.024
Measurement Method: Thermal transport methods
The authors cite Compendium of Thermophysical Property Measurement Methods, edited by K.D. Maglic, A. Cezairliyan, and V.E. Peletsky, Plenum, New York (1984), and summarize the procedure as follows. "Below 160 K we measured k by the standard longitudinal steady-state method. However, in this method thermal radiation can lead to serious overestimates of k at high T... above 70 K we... used instead the standard version of Angstrom's temperature wave method, which, in principle, eliminates heat-loss effects. This method actually measures the thermal diffusivity β, but k can be found from k = βdc

, where c

is the specific-heat capacity. All measurements were carried out in a vacuum of about 2 x 10-5 mbar... The sample was provided with a heater in one end and was attached at the other to a copper heat sink to which all wires were thermally anchored, and which could be screwed to the inside of a Cu chamber in the cryostat. In the steady-state method, k was measured over a distance of 5.3 mm on the sample using calibrated type-K thermocouples, 50 µm in diameter. The heater power was calculated from measured currents and voltages, and the data were corrected for Joule heating in, and heat conduction along, connecting wires. ... The thermal diffusivity β was measured using Angstrom's method, i.e., calculating a from the attenuation and phase shift of a temperature wave between two points on the sample. In this experiment the two points were separated by about 1 mm, the signal period was in the range 4-30 s..."

Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.