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: Superconducting Properties of YBa₂(Cu_1-xM_x)₃O_7-δ (M = Ti, V)
Author(s): V.P.N. Padmanaban and K. Shahi
Publication: Physica C Volume: 208 Issue: Not Available Year: 1993 Page(s): 263-276
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Critical Temperature, Resistivity (normal state), Thermoelectric Power

Materials and Properties

Y:123; [Y-Ba-Cu(Ti)-O]

Y:123; [Y-Ba-Cu(V)-O]

Material Specification for Y:123; [Y-Ba-Cu(Ti)-O] Process: Solid State Reaction
Notes: "... samples were prepared by the solid state reaction method. Appropriate amounts of high-purity (3 to 5N) Y₂O₃, BaCO₃, CuO, and TiO₂ or V₂O₃ were mixed thoroughly in acetone medium carried in an agate mortar. The mixture was calcined at... 940 °C in air/O₂ for 24 h followed by furnace cooling. The product was ground, pressed into pellets, and heat treated at... 960 °C for 24 h and furnace cooled. The above procedure was repeated with intermittent grinding steps to homogenize the samples. The product was reground and pressed (8-9 ton/cm²) into disc-shaped pellets which were finally sintered in the temperature range 975-985 °C (depending upon the composition) in air/O₂ for 24 h. These samples were then slow cooled (1 °C/min) to 700 °C and held for 12 h, followed by cooling in 100 °C steps to 400 °C, holding for 12 h at each step. Then the samples were furnace cooled to 200 °C."
Formula: YBa₂Cu_3-xTi_xO_y
Informal Name: Y:123
Chemical Family: Y-Ba-Cu(Ti)-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Temperature for Y:123; [Y-Ba-Cu(Ti)-O]

x (formual units)	y (formula units)	ΔT_c (K)	Critical Temperature (K)
0.0	6.94	0.3	93.0
0.075	6.98	0.6	90.8
0.15	--	0.8	91.3
0.225	--	0.9	91.4
0.3	--	0.8	91.3

Measurement Method: Electrical resistivity method
The authors cite V.P.N. Padmanaban et al., Physica C, Vol. 172, 427 (1992). No additional measurement details were noted.

Cautions: Evaluated Data

Resistivity (normal state) for Y:123; [Y-Ba-Cu(Ti)-O]

x (formula units)	Temperature (K)	Resistivity (normal state) (mΩ·cm)
0.3	90	0.0
0.3	92	1.9
0.3	92	5.1
0.3	102	6.2
0.3	148	7.4
0.3	203	8.5
0.3	300	10.2
0.225	90	0.0
0.225	90	0.9
0.225	92	2.2
0.225	94	2.8
0.225	152	4.2
0.225	201	4.7
0.225	252	5.3
0.225	300	5.8
0.15	90	0.1
0.15	92	0.9
0.15	92	2.2
0.15	135	2.8
0.15	155	3.0
0.15	203	3.5
0.15	252	3.8
0.15	300	4.0
0.075	90	0.0
0.075	90	0.9
0.075	160	1.5
0.075	201	1.6
0.075	300	2.2
0	90	0.1
0	90	0.1
0	148	0.3
0	201	0.3
0	252	0.4
0	300	0.5

Thermoelectric Power for Y:123; [Y-Ba-Cu(Ti)-O]

x (formula units)	Temperature (K)	Thermoelectric Power (µV/K)
0.3	91	0.1
0.3	89	1.1
0.3	92	3.1
0.3	92	6.0
0.3	99	6.9
0.3	135	7.0
0.3	156	7.2
0.3	200	7.1
0.3	256	7.1
0.3	300	7.1
0.075	91	0.1
0.075	92	1.1
0.075	92	2.3
0.075	92	3.3
0.075	118	4.1
0.075	153	4.2
0.075	200	3.9
0.075	247	3.8
0.075	300	3.6

Measurement Method: Thermopower method
"For thermopower measurements, good thermal (as well as electrical) contacts were secured between the heat source, the sample, and the sink, and between the thermocouple (copper vs. constantan) and the sample by placing the fine tip of the thermocouple junction just above and at the center of the sample. A temperature difference of... 1 K was generally applied across the sample with the help of an auxiliary heater." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 13 of the paper.

Material Specification for Y:123; [Y-Ba-Cu(V)-O] Process: Solid State Reaction
Notes: "... samples were prepared by the solid state reaction method. Appropriate amounts of high-purity (3 to 5N) Y₂O₃, BaCO₃, CuO, and TiO₂ or V₂O₃ were mixed thoroughly in acetone medium carried in an agate mortar. The mixture was calcined at... 940 °C in air/O₂ for 24 h followed by furnace cooling. The product was ground, pressed into pellets, and heat treated at... 960 °C for 24 h and furnace cooled. The above procedure was repeated with intermittent grinding steps to homogenize the samples. The product was reground and pressed (8-9 ton/cm²) into disc-shaped pellets which were finally sintered in the temperature range 975-985 °C (depending upon the composition) in air/O₂ for 24 h. These samples were then slow cooled (1 °C/min) to 700 °C and held for 12 h, followed by cooling in 100 °C steps to 400 °C, holding for 12 h at each step. Then the samples were furnace cooled to 200 °C."
Formula: YBa₂Cu_3-xV_xO_y
Informal Name: Y:123
Chemical Family: Y-Ba-Cu(V)-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Critical Temperature for Y:123; [Y-Ba-Cu(V)-O]

x (formual units)	y (formula units)	ΔT_c (K)	Critical Temperature (K)
0.0	6.94	0.3	93.0
0.075	7.07	0.5	92.1
0.15	7.14	0.6	92.5
0.225	7.16	0.6	92.9
0.3	--	0.5	92.6
0.6	--	0.4	92.3

Resistivity (normal state) for Y:123; [Y-Ba-Cu(V)-O]

x (formula units)	Temperature (K)	Resistivity (normal state) (mΩ·cm)
0.6	93	0.0
0.6	93	0.5
0.6	93	1.8
0.6	112	2.3
0.6	157	3.1
0.6	198	3.7
0.6	243	4.3
0.6	300	5.2
0.3	93	0.0
0.3	93	0.6
0.3	129	0.9
0.3	152	0.9
0.3	200	1.2
0.3	245	1.3
0.3	300	1.5
0.15	93	0.0
0.15	95	0.3
0.15	152	0.6
0.15	198	0.7
0.15	245	0.9
0.15	300	0.9
0	93	0.0
0	93	0.1
0	152	0.3
0	200	0.3
0	248	0.5
0	300	0.5

Thermoelectric Power for Y:123; [Y-Ba-Cu(V)-O]

x (formula units)	Temperature (K)	Thermoelectric Power (µV/K)
0.3	91	0.0
0.3	92	1.9
0.3	93	3.9
0.3	93	4.9
0.3	98	5.3
0.3	122	5.1
0.3	147	4.6
0.3	196	4.1
0.3	252	4.0
0.3	300	3.9
0.15	91	0.0
0.15	92	1.9
0.15	93	4.0
0.15	93	4.7
0.15	105	4.9
0.15	147	4.2
0.15	194	3.6
0.15	252	3.4
0.15	300	3.3
0.075	91	0.0
0.075	92	1.5
0.075	93	2.9
0.075	93	4.0
0.075	100	4.3
0.075	151	3.4
0.075	198	2.8
0.075	247	2.6
0.075	300	2.5