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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: Zn and Ga Substitution in Superconducting YBa2Cu4O8
Author(s): S.P. Pandey, M.S. Hegde, B.V. Kumaraswamy, and A.V. Narlikar
Publication: Physica C Volume: 206 Issue: Not Available Year: 1993 Page(s): 207-216
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature, Resistivity (normal state)

Materials and Properties

Y:124; [Y-Ba-Cu(Zn)-O]
Y:124; [y-ba-cu(ga)-o]
Material Specification for Y:124; [Y-Ba-Cu(Zn)-O] Process: Solid State Reaction
Notes: "The samples... were prepared by the solid state reaction method with Y2O3, Ba(NO3)2, CuO, ZnO and Ga2O3, each of 4N purity, as starting materials. These were mixed in the correct stoichiometric ratio required for each sample, along with 0.2 mole fraction of sodium oxalate (Na2C2O4). The synthesis process is relatively simple, involving two steps. In the first step, the homogeneously mixed constituents were prereacted in the powder form for 30 min at 900 °C and then cold pressed into rectangular bars which were again reacted for 24 h at 900 °C in a continuous flow of oxygen. In the second step the reaction temperature was reduced to 815 °C for another 48 h."
Formula: YBa2Cu4-xZnxO8
Informal Name: Y:124
Chemical Family: Y-Ba-Cu(Zn)-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for Y:124; [Y-Ba-Cu(Zn)-O]
Crystal System: Orthorhombic
Formula Units per Cell:
Space Group:
Cell Parameters
x (formula units) Temp K a Å b Å c Å
0.00 296 3.841 3.860 27.200
0.04 296 3.836 3.860 27.175
0.08 296 3.839 3.860 27.200
0.24 296 3.836 3.860 27.200
0.40 296 3.836 3.859 27.145
0.80 296 3.835 3.856 27.145
Measurement Method: X-ray diffraction
"X-ray diffraction patterns of the samples were recorded using a Siemens D-500 X-ray diffractometer with CuKα radiation." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 6 of the paper.
Critical Temperature for Y:124; [Y-Ba-Cu(Zn)-O]
x (formula units) Tc (onset) () Critical Temperature (K)
0.00 79 76
0.04 63 59
0.08 39 35
0.12 30 24
0.16 30 24
0.24 30 24
0.40 30 24
0.80 30 10
Measurement Method: Four-probe method
"Measurements of the temperature dependence of resistivity of the pure and the substituted Y-124 samples were carried out using the standard four-probe technique. Air drying silver paste was used to make electrical contacts on the samples. The temperature of the sample was monitored using a 100 Ω platinum resistance thermometer." No additional measurement details were noted.

Cautions: Evaluated Data
Resistivity (normal state) for Y:124; [Y-Ba-Cu(Zn)-O]
x (formula units) Temperature (K) Resistivity (normal state) (mΩ·cm)
0 76 0.00
0 82 0.24
0 120 0.36
0 172 0.54
0 228 0.71
0 299 0.95
0.04 59 0.00
0.04 62 0.37
0.04 89 0.54
0.04 127 0.70
0.04 177 0.90
0.04 221 1.08
0.04 263 1.20
0.08 34 0.00
0.08 36 0.54
0.08 53 0.65
0.08 99 0.81
0.08 157 1.01
0.08 202 1.15
0.08 258 1.32
0.16 23 0.00
0.16 24 0.53
0.16 26 0.60
0.16 61 0.79
0.16 100 0.95
0.16 151 1.15
0.16 192 1.29
0.16 249 1.48
0.80 8 0.00
0.80 13 0.53
0.80 15 1.06
0.80 36 1.28
0.80 71 1.39
0.80 130 1.59
0.80 185 1.74
0.80 235 1.90
Measurement Method: Four-probe method
"Measurements of the temperature dependence of resistivity of the pure and the substituted Y-124 samples were carried out using the standard four-probe technique. Air drying silver paste was used to make electrical contacts on the samples. The temperature of the sample was monitored using a 100 Ω platinum resistance thermometer." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
Material Specification for Y:124; [Y-Ba-Cu(Ga)-O] Process: Solid State Reaction
Notes: "The samples... were prepared by the solid state reaction method with Y2O3, Ba(NO3)2, CuO, ZnO and Ga2O3, each of 4N purity, as starting materials. These were mixed in the correct stoichiometric ratio required for each sample, along with 0.2 mole fraction of sodium oxalate (Na2C2O4). The synthesis process is relatively simple, involving two steps. In the first step, the homogeneously mixed constituents were prereacted in the powder form for 30 min at 900 °C and then cold pressed into rectangular bars which were again reacted for 24 h at 900 °C in a continuous flow of oxygen. In the second step the reaction temperature was reduced to 815 °C for another 48 h."
Formula: YBa2Cu4-xGaxO8
Informal Name: Y:124
Chemical Family: Y-Ba-Cu(Ga)-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for Y:124; [Y-Ba-Cu(Ga)-O]
Crystal System: Orthorhombic
Formula Units per Cell:
Space Group:
Cell Parameters
x (formula units) Temp K a Å b Å c Å
0.00 296 3.836 3.860 27.200
0.04 296 3.844 3.869 26.750
0.12 296 3.841 3.882 26.715
0.16 296 3.841 3.885 26.714
0.40 296 3.865 3.883 26.710
0.80 296 3.857 3.882 26.688
Measurement Method: X-ray diffraction
"X-ray diffraction patterns of the samples were recorded using a Siemens D-500 X-ray diffractometer with CuKα radiation." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 8 of the paper.
Critical Temperature for Y:124; [Y-Ba-Cu(Ga)-O]
x (formula units) Tc (onset) () Critical Temperature (K)
0.04 79 69
0.08 78 61
0.12 77 50
0.16 75 39
0.24 74 39
0.40 74 39
Measurement Method: Four-probe method
"Measurements of the temperature dependence of resistivity of the pure and the substituted Y-124 samples were carried out using the standard four-probe technique. Air drying silver paste was used to make electrical contacts on the samples. The temperature of the sample was monitored using a 100 Ω platinum resistance thermometer." No additional measurement details were noted.

Cautions: Evaluated Data
Resistivity (normal state) for Y:124; [Y-Ba-Cu(Ga)-O]
x (formula units) Temperature (K) Resistivity (normal state) (mΩ·cm)
0.04 67 0.00
0.04 73 1.18
0.04 82 1.65
0.04 124 1.91
0.04 167 2.16
0.04 205 2.35
0.04 240 2.54
0.08 60 0.00
0.08 65 1.72
0.08 68 3.67
0.08 71 5.82
0.08 81 6.48
0.08 135 6.47
0.08 190 6.52
0.08 248 6.50
0.16 37 0
0.16 53 12
0.16 68 22
0.16 78 24
0.16 136 23
0.16 193 20
0.16 259 18
0.40 37 1
0.40 48 30
0.40 53 67
0.40 54 105
0.40 57 143
0.40 65 169
0.40 93 173
0.40 170 167
0.40 273 152
Measurement Method: Four-probe method
"Measurements of the temperature dependence of resistivity of the pure and the substituted Y-124 samples were carried out using the standard four-probe technique. Air drying silver paste was used to make electrical contacts on the samples. The temperature of the sample was monitored using a 100 Ω platinum resistance thermometer." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 9 of the paper.