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: Superconductivity of Bi-2201 (n=1) as Influenced by the Substitution of Pb and/or Rare-Earths (R=La, Nd and Pr)
Author(s): P.V.P.S.S. Sastry, J.V. Yakhmi, R.M. Iyer, C.K. Subramanian, and R. Srinivasan
Publication: Physica C Volume: 178 Issue: Not Available Year: 1991 Page(s): 110-118
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography, Critical Temperature, Magnetic Susceptibility

Materials and Properties

Bi:221; [Bi-Sr(La)-Cu-O]

Material Specification for Bi:221; [Bi-Sr(La)-Cu-O] Process: Solid State Reaction
Notes: The authors cite P.V.P.S.S. Sastry, et al., Physica C, Vol. 156, 230 (1988), and summarize the procedure as follows. "... samples... were synthesized by a two-step precursor-matrix reaction route. In the first step, a suitable matrix was synthesized by reacting all the required component oxides in the form of CuO, SrCO₃, La₂O₃, Nd₂O₃, Pr₄O₇ (i.e. excepting Bi₂O₃ and PbO) in appropriate proportion at 920 °C in air for about 24 h with several intermittent grindings. The matrix was heated till all the carbonate was decomposed which was checked by dissolving a small amount of the matrix in dilute HCl and looking for absence of effervescence. In the second step the matrix was mixed thoroughly with a stoichiometric amount of Bi₂O₃ and PbO and reacted at 900 °C for 5-10 min until it turned completely black. The product was powdered, pelletised (12 mm diameter, 2 mm thickness) and annealed at 850-860 °C for 20 h, followed by quenching in air to room temperature by withdrawing the sample suddenly from the furnace, or by quenching in liquid nitrogen (77 K)."
Formula: Bi₂Sr_2-xLa_xCuO_6+y
Informal Name: Bi:221
Chemical Family: Bi-Sr(La)-Cu-O
Chemical Class: Oxide
Structure Type:
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for Bi:221; [Bi-Sr(La)-Cu-O]

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

**Cell Parameters**
x of La_x (formula units)	Temp K	a Å	b Å	c Å
0.0	296	5.3775	5.3655	24.600
0.1	296	5.3721	5.3863	24.6095
0.2	296	5.3780	5.3990	24.5870
0.3	296	5.3837	5.4029	24.5562
0.4	296	5.3885	5.4088	24.5244
0.5	296	5.3976	5.4142	24.3710
0.6	296	5.4106	5.4212	24.1710
1.0	296	5.4338	5.4338	24.0000

Measurement Method: X-ray diffraction
"X-ray diffraction patterns were recorded using CuKα on a Phillips PW 1013 diffractometer. The XRD pattern for each composition was indexed using an orthorhombic cell (space group Amaa) and the cell dimensions were estimated by the least squares method."

Cautions: Evaluated Data

Critical Temperature for Bi:221; [Bi-Sr(La)-Cu-O]

x of La_x (formula units)	Critical Temperature (K)
0.0	9
0.1	13
0.2	16
0.3	18
0.4	19
0.5	0
0.6	0
0.8	0
1.0	0

Measurement Method: Four-probe method
"The electrical resistivity of the samples was measured... by a standard DC four-probe technique. The voltage drop across the inner probes was monitored ... with a resolution of 0.1 µV. The temperature of the sample was determined,... by using a calibrated Si-diode placed next to the sample."

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

Material Specification for Bi:221; [Bi(Pb)-Sr(La)-Cu-O] Process: Solid State Reaction
Notes: The authors cite P.V.P.S.S. Sastry, et al., Physica C, Vol. 156, 230 (1988), and summarize the procedure as follows. "... samples... were synthesized by a two-step precursor-matrix reaction route. In the first step, a suitable matrix was synthesized by reacting all the required component oxides in the form of CuO, SrCO₃, La₂O₃, Nd₂O₃, Pr₄O₇ (i.e. excepting Bi₂O₃ and PbO) in appropriate proportion at 920 °C in air for about 24 h with several intermittent grindings. The matrix was heated till all the carbonate was decomposed which was checked by dissolving a small amount of the matrix in dilute HCl and looking for absence of effervescence. In the second step the matrix was mixed thoroughly with a stoichiometric amount of Bi₂O₃ and PbO and reacted at 900 °C for 5-10 min until it turned completely black. The product was powdered, pelletised (12 mm diameter, 2 mm thickness) and annealed at 850-860 °C for 20 h, followed by quenching in air to room temperature by withdrawing the sample suddenly from the furnace, or by quenching in liquid nitrogen (77 K)."
Formula: Bi_2-xPb_xSr_2-xLa_xCuO_6+y
Informal Name: Bi:221
Chemical Family: Bi(Pb)-Sr(La)-Cu-O
Chemical Class: Oxide
Structure Type:
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:

Crystallography for Bi:221; [Bi(Pb)-Sr(La)-Cu-O]

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

**Cell Parameters**
x of La_x (formula units)	Temp K	a Å	b Å	c Å
0.1	296	5.3558	5.3713	24.6248
0.2	296	5.3516	5.3799	24.6000
0.3	296	5.3339	5.3858	24.5605
0.4	296	5.3215	5.3991	24.4970

Magnetic Susceptibility for Bi:221; [Bi(Pb)-Sr(La)-Cu-O]

x of La_x (formula units)	Temperature (K)	Magnetic Susceptibility (arbitrary)
0.0	4	-0.0006
0.0	7	-0.0003
0.0	11	0.0000
0.0	14	0.0000
0.0	19	0.0000
0.0	25	0.0000
0.0	29	0.0000
0.1	4	-0.0020
0.1	8	-0.0012
0.1	10	-0.0007
0.1	13	-0.0003
0.1	17	0.0000
0.1	21	0.0000
0.1	25	0.0000
0.1	28	0.0000
0.2	5	-0.0031
0.2	7	-0.0025
0.2	9	-0.0018
0.2	12	-0.0011
0.2	14	-0.0005
0.2	17	-0.0002
0.2	19	0.0000
0.2	23	0.0000
0.2	28	0.0000
0.3	2	-0.0046
0.3	7	-0.0036
0.3	13	-0.0018
0.3	17	-0.0007
0.3	20	-0.0002
0.3	22	0.0000
0.3	24	0.0000
0.3	27	0.0000
0.3	30	0.0000
0.4	2	-0.0071
0.4	7	-0.0057
0.4	12	-0.0038
0.4	16	-0.0019
0.4	19	-0.0006
0.4	22	-0.0002
0.4	23	0.0000
0.4	25	0.0000
0.4	29	0.0000

Measurement Method: SQUID magnetometer
"DC magnetic susceptibility data was obtained using a SQUID magnetometer."

Cautions: Evaluated Data