NIST High Temp. Superconducting Materials (HTS) Database

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: Specific Heat and Anisotropic Superconducting and Normal- State Magnetization of HoNi₂B₂C
Author(s): P.C. Canfield, B.K. Cho, D.C. Johnson, D.K. Finnemore, and M.F. Hundley
Publication: Physica C Volume: 230 Issue: Not Available Year: 1994 Page(s): 397-406
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Magnetic Susceptibility, Specific Heat

Materials and Properties

[Ho-Ni-B-C]

Material Specification for ; [Ho-Ni-B-C] Process: Flux Growth
Notes: The authors cite M. Xu et al., Physica C, Vol. 227, 321 (1994), and summarize the procedure as follows. "Crystals of HoNi₂B₂C were grown via high-temperature flux growth. Stoichiometric HoNi₂B₂C was arc-melted under an argon atmosphere and quenched and a water-cooled copper hearth. Ni₂B flux was prepared in a similar manner. The HoNi₂B₂C was then annealed at 1050 °C for 24 h to insure it was single phase. 2 g of Ni₂B and 1 g of HoNi₂B₂C were then placed in an alumina crucible and heated to 1500 °C under a flowing atmosphere of argon. The growth was then cooled to 1200 °C at a rate of 10 °C/h at which point the furnace was shut off and allowed to cool to room temperature. Plates of HoNi₂B₂C with dimensions as large as 6x6x0.1 mm³ were removed from the flux."
Formula: HoNi₂B₂C
Informal Name:
Chemical Family: Ho-Ni-B-C
Chemical Class: Carbide
Structure Type: Single Crystal
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Magnetic Susceptibility for ; [Ho-Ni-B-C]

Angle(H,c) (degrees)	Magnetic Field (kA/m)	Temperature (K)	Magnetic Susceptibility (arbitrary)
0	1.6	5.1	-1.2
0	1.6	5.3	-0.8
0	1.6	6.1	-1.0
0	1.6	6.7	-0.9
0	1.6	7.4	-0.7
0	1.6	7.7	-0.2
0	1.6	8.3	0.1
0	1.6	11.0	0.1
0	1.6	12.9	0.1
0	1.6	14.5	0.1
90	1.6	2.0	-0.8
90	1.6	3.4	-0.8
90	1.6	4.0	-0.7
90	1.6	4.4	-0.2
90	1.6	5.0	0.2
90	1.6	5.3	0.4
90	1.6	5.5	0.3
90	1.6	6.1	0.2
90	1.6	6.8	0.3
90	1.6	7.0	0.4
90	1.6	8.0	0.6
90	1.6	10.0	0.6
90	1.6	12.0	0.5
90	1.6	14.5	0.3
90	160	2.0	0.1
90	160	3.1	0.1
90	160	3.9	0.2
90	160	4.6	0.2
90	160	5.0	0.3
90	160	5.2	0.6
90	160	5.4	0.7
90	160	6.0	0.7
90	160	7.2	0.7
90	160	8.4	0.6
90	160	10.6	0.5
90	160	12.5	0.4
90	160	14.5	0.3

Measurement Method: SQUID magnetometer
"Magnetization measurements were carried out on the HoNi₂B₂C crystals using a Quantum Design SQUID magnetometer. ... The sample was cooled in a field of less than (79.6 A/m = 1 Oe) to 2 K, at which point the measuring field was applied and data were collected upon warming to 4 K. The sample was then warmed to 20 K, the field was reduced to below (79.6 A/m) again and the sample was cooled to 4.5 K at which point the measurement field was again applied and the rest of the data set was collected on warming."

Cautions: Evaluated Data
Digitized data were obtained from Figure 1a of the paper.

Specific Heat for ; [Ho-Ni-B-C]

Temperature (K)	Specific Heat (J kg^-1 K^-1)
2.02	4.9
4.05	13.6
5.04	86.8
5.12	299.1
5.18	115.9
5.20	89.4
5.25	76.0
5.30	71.5
5.44	69.7
5.49	62.2
5.56	47.4
5.63	41.3
5.94	37.7
5.96	34.7
6.06	27.1
6.32	20.7
6.57	17.2
8.34	8.2
9.92	6.3

Measurement Method: Calorimetry
The authors cite R. Bachmann et al., Rev. Sci. Instr., Vol. 43, 205 (1972), and summarize the procedure as follows. "The specific-heat measurements were performed from 1.5 K to 20 K in a small sample mass calorimeter that employs a thermal relaxation measurement technique."

Cautions: Evaluated Data
Digitized data were obtained from Figures 3a and 3b of the paper.