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: Normal-State Susceptibility versus Oxygen Content in the Y₂Ba₄Cu₇O_x Superconducting Phase
Author(s): G. Triscone, J.Y. Genoud, T. Graf, A. Junod, and J. Muller
Publication: Physica C Volume: 201 Issue: Not Available Year: 1992 Page(s): 1-5
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature, Magnetic Susceptibility

Y:247; [Y-Ba-Cu-O]

Material Specification for Y:247; [Y-Ba-Cu-O] Process: Solid State Reaction
Notes: The authors cite J.Y. Genoud et al., Physica C, Vol. 192, 137 (1992), and summarize the procedure as follows. "The high-purity ceramic samples were prepared using the high-pressure and high-temperature synthesis technique (2 MPa O₂, 1020 °C). A subsequent heat treatment at specified temperatures and oxygen pressures, followed by quenching into liquid gallium, was performed to vary and homogenize the oxygen concentration."
Formula: Y₂Ba₄Cu₇O_x
Informal Name: Y:247
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:

Crystallography for Y:247; [Y-Ba-Cu-O]

Crystal System:	Orthorhombic
Formula Units per Cell:
Space Group:

**Cell Parameters**
x of O_x (formula units)	Temp K	a Å	b Å	c Å
14.13	296	3.8467(4)	3.8662(4)	50.851(5)
14.35	296	3.8468(4)	3.8678(2)	50.808(5)
14.39	296	3.8450(4)	3.8694(4)	50.785(5)
14.48	296	3.8425(4)	3.8719(4)	50.709(4)
14.71	296	3.8379(4)	3.8762(3)	50.674(4)
14.82	296	3.8366(5)	3.8758(4)	50.631(5)
14.89	296	3.8339(5)	3.8767(6)	50.611(5)
15.09	296	3.8302(3)	3.8753(2)	50.584(3)

Measurement Method: X-ray diffraction

Cautions: Unevaluated Data
No measurement details were noted.

Critical Temperature for Y:247; [Y-Ba-Cu-O]

x of O_x (formula units)	Critical Temperature (K)
14.13	35.2
14.35	39.6
14.39	42.0
14.48	55.6
14.71	66.9
14.82	70.0
14.89	80.8
15.09	94.1

Measurement Method: SQUID magnetometer
"A RF SQUID magnetometer was used for all magnetic measurements. For Meissner measurements (field cooling), the field was calibrated by means of a high-purity Pb sphere in the Meissner state. We took into account the demagnetization factor of the samples (both for Pb and Y₂Ba₄Cu₇O_x). The Meissner flux expulsion was recorded in (1.59 kA/m = 20 Oe)."

Cautions: Evaluated Data

Magnetic Susceptibility for Y:247; [Y-Ba-Cu-O]

x of O_x (formula units)	Temperature (K)	Magnetic Susceptibility (arbitrary)
14.13	5	-0.24
14.13	18	-0.23
14.13	28	-0.19
14.13	33	-0.06
14.13	36	-0.01
14.13	40	0.00
14.13	90	0.00
14.35	5	-0.38
14.35	23	-0.37
14.35	32	-0.26
14.35	36	-0.09
14.35	40	-0.04
14.35	41	-0.02
14.35	42	-0.01
14.39	5	-0.40
14.39	20	-0.39
14.39	30	-0.37
14.39	36	-0.26
14.39	39	-0.15
14.39	41	-0.04
14.39	43	0.00
14.39	65	0.00
14.48	6	-0.38
14.48	20	-0.38
14.48	38	-0.37
14.48	49	-0.29
14.48	52	-0.14
14.48	55	-0.03
14.71	32	-0.44
14.71	46	-0.44
14.71	60	-0.34
14.71	63	-0.14
14.71	66	-0.04
14.71	68	0.00
14.71	70	0.00
14.82	5	-0.44
14.82	30	-0.44
14.82	50	-0.44
14.82	60	-0.40
14.82	66	-0.29
14.82	68	-0.11
14.82	70	-0.04
14.82	74	0.00
14.82	75	0.00
14.89	5	-0.46
14.89	30	-0.46
14.89	60	-0.46
14.89	71	-0.39
14.89	76	-0.28
14.89	79	-0.15
14.89	81	-0.04
14.89	83	0.00
14.89	85	0.00
15.09	5	-0.56
15.09	30	-0.56
15.09	60	-0.55
15.09	80	-0.52
15.09	91	-0.40
15.09	93	-0.22
15.09	94	0.00
15.09	100	0.00