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: Effect of Oxygen Deficiency on the Normal and Superconduct- ing Properties of CaLaBaCu₃O_y
Author(s): T. Yagi, M. Domon, Y. Okajima, and K. Yamaya
Publication: Physica C Volume: 173 Issue: Not Available Year: 1991 Page(s): 453-457
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature, Resistivity (normal state), Magnetic Susceptibility

Materials and Properties

CaLa:123; [Ca-La(Ba)-Cu-O]

Material Specification for CaLa:123; [Ca-La(Ba)-Cu-O] Process: Solid State Reaction
Notes: "Samples were prepared by a solid-state reaction between CaCO₃, La₂O₃, BaCO₃ and CuO powders. Appropriate amounts of the powder were mixed and calcined at 900 °C and 950 °C for 20 h in air with intermediate grindings. The powder was pressed into pellets of diameter 20 mm. The pellets were fired for 10 h at 950 °C and then annealed for 20 h in air at temperatures between 400 and 1000 °C at 50 °C intervals. Oxygen contents in the pellets are varied by the different annealing temperature. Samples with various oxygen content were prepared by quenching the pellets from the annealing temperature to liquid nitrogen... Oxygen content was determined by an iodometric titration method with an accuracy of ±0.02."
Formula: CaLaBaCu₃O_x
Informal Name: CaLa:123
Chemical Family: Ca-La(Ba)-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for CaLa:123; [Ca-La(Ba)-Cu-O]

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

**Cell Parameters**
x of O_x (formula units)	Temp K	a Å	b Å	c Å
6.61	296	3.874	--	11.726
6.67	296	3.867	--	11.730
6.69	296	3.872	--	11.728
6.76	296	3.869	--	11.736
6.83	296	3.868	--	11.721
6.85	296	3.871	--	11.694
6.89	296	3.863	--	11.673

Measurement Method: X-ray diffraction
"Powder X-ray diffraction patterns were recorded on a diffractometer with CuKα radiation." No additional measurement details were noted.

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

Critical Temperature for CaLa:123; [Ca-La(Ba)-Cu-O]

x of O_x (formula units)	Critical Temperature (K)
6.69	0
6.71	35
6.76	43
6.79	55
6.84	60
6.84	69
6.87	75
6.90	80
6.97	81

Measurement Method: Four-probe method
"Bars for resistivity measurements were cut from the centers of the quenched pellets, with approximate dimensions 1 x 1 x 5 mm³, and were measured by a four-probe method with silver-paint contacts." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Figure 4 of the paper.

Resistivity (normal state) for CaLa:123; [Ca-La(Ba)-Cu-O]

x of O_x (formula units)	Temperature (K)	Resistivity (normal state) (mΩ·cm)
6.88	80	1.3
6.88	90	1.7
6.88	100	2.1
6.88	200	3.2
6.88	290	4.1
6.83	60	1.3
6.83	70	2.7
6.83	100	2.9
6.83	200	4.3
6.83	290	4.9
6.71	30	1.2
6.71	35	2.7
6.71	40	4.9
6.71	45	6.1
6.71	65	6.0
6.71	100	5.6
6.71	200	6.9
6.71	290	8.4
6.67	10	55
6.67	30	27
6.67	60	17
6.67	100	13
6.67	200	12
6.67	290	13

Magnetic Susceptibility for CaLa:123; [Ca-La(Ba)-Cu-O]

x of O_x (formula units)	Temperature (K)	Magnetic Susceptibility (arbitrary)
6.88	40	-0.81
6.88	50	-0.80
6.88	60	-0.80
6.88	70	-0.79
6.88	75	-0.59
6.88	78	-0.03
6.88	81	0.00
6.88	90	0.00
6.83	9	-0.86
6.83	20	-0.85
6.83	29	-0.85
6.83	40	-0.76
6.83	45	-0.52
6.83	50	-0.03
6.83	53	0.00
6.83	60	0.00
6.71	4	-0.22
6.71	10	-0.08
6.71	15	-0.02
6.71	20	0.00

Measurement Method: Ac susceptibility
"... the temperature dependence of AC magnetic susceptibility... (was determined) for samples cooled in a magnetic field of circa (39.8 A/m = 0.5 Oe)." No additional measurement details were noted.

Cautions: Evaluated Data
Digitized data were obtained from Fig. 3 of the paper.