Hts Logo

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: Structure and Superconducting Properties of Tl1-yPbyY1-xCaxSr2Cu2O7
Author(s): R. Vijayaraghavan, N. Rangavittal, G.U. Kulkarni, E. Grantscharova, T.N. Guru Row, and C.N.R. Rao
Publication: Physica C Volume: 179 Issue: Not Available Year: 1991 Page(s): 183-190
Editor(s): Not Available
Publisher: Elsevier Science Publishers B.V.
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography

Materials and Properties

Tl:1212; [Tl(Pb)-Sr-Ca(Y)-Cu-O]
Material Specification for Tl:1212; [Tl(Pb)-Sr-Ca(Y)-Cu-O] Process: Solid State Reaction
Notes: "Cuprates... were synthesized by reacting calculated amounts of Tl2O3 and PbO2 with an oxide matrix containing Y, Ca, or Sr and Cu (prepared initially by heating the mixture of the corresponding cabonates and oxides at 1200 K for 24 h) at 1160 K for 3 h in sealed silver tubes."
Formula: Tl1-yPbySr2CaxY1-xCu2O7
Informal Name: Tl:1212
Chemical Family: Tl(Pb)-Sr-Ca(Y)-Cu-O
Chemical Class: Oxide
Structure Type:
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Tl:1212; [Tl(Pb)-Sr-Ca(Y)-Cu-O]
Crystal System: Tetragonal
Formula Units per Cell:
Space Group: P4/mmm
Cell Parameters
x of Cax (formula units) Occupancy () Temp K a Å b Å c Å
0 -- 296 3.830(4) -- 12.031(17)
0.25 -- 296 3.826(3) -- 12.040(10)
0.5 -- 296 3.814(8) -- 12.066(29)
0.75 -- 296 3.807(8) -- 12.124(3)
1 -- 296 3.804(5) -- 12.165(17)
Atomic Coordinates
x of Cax (formula units) Occupancy () Atom Temp K a-axis b-axis c-axis
0 0.984(7) Tl(1) 296 0 0 0.5
0 0.984(7) Pb 296 0 0 0.5
0 0.985(17) Sr(1) 296 0.5 0.5 0.2898(9)
0 0.063(16) Y(2) 296 0.5 0.5 0
0 -- Ca(2) 296 0.5 0.5 0
0 -- Ca(1) 296 0.5 0.5 0
0 0.984(21) Y(1) 296 0.5 0.5 0
0 0.016(7) Tl(2) 296 0 0 0.5
0 -- Cu 296 0 0 0.1378(9)
0 -- O(1) 296 0.5 0 0.1214(33)
0 -- O(2) 296 0 0 0.3250(50)
0 -- Pb 296 0.5 0.5 0.4999
0.25 0.975(6) Tl(1) 296 0 0 0.5
0.25 0.975(6) Pb) 296 0 0 0.5
0.25 0.980(12) Sr(1) 296 0.5 0.5 0.2875(6)
0.25 0.035(13) Y(2) 296 0.5 0.5 0
0.25 0.020(26) Ca(2) 296 0.5 0.5 0
0.25 0.239(33) Ca(1) 296 0.5 0.5 0
0.25 0.738(16) Y(1) 296 0.5 0.5 0
0.25 0.025(6) Tl(2) 296 0 0 0.5
0.25 -- Cu) 296 0 0 0.1360(7)
0.25 -- O(1) 296 0.5 0 0.1229(26)
0.25 -- O(2) 296 0 0 0.3232(26)
0.25 -- O(3) 296 0.5 0.5 0.4913
0.5 0.949(2) Tl(1) 296 0 0 0.5
0.5 0.949(2) Pb 296 0 0 0.5
0.5 0.980(25) Sr(1) 296 0.5 0.5 0.2884(12)
0.5 0.029(24) Y(2) 296 0.5 0.5 0
0.5 0.013(50) Ca(2) 296 0.5 0.5 0
0.5 0.467(64) Ca(1) 296 0.5 0.5 0
0.5 0.482(31) Y(1) 296 0.5 0.5 0
0.5 0.052(11) Tl(2) 296 0 0 0.5
0.5 -- Cu 296 0 0 0.1374(15)
0.5 -- O(1) 296 0.5 0 0.1336(51)
0.5 -- O(2) 296 0.5 0 0.3352(73)
0.5 -- O(3) 296 0 0.5 0.4798
0.75 0.928(12) Tl(1) 296 0 0 0.5
0.75 0.928(12) Pb 296 0 0 0.5
0.75 0.980(26) Sr(1) 296 0.5 0.5 0.2869(12)
0.75 0.015(24) Y(2) 296 0.5 0.5 0
0.75 0.018(52) Ca(2) 296 0.5 0.5 0
0.75 0.738(67) Ca(1) 296 0.5 0.5 0
0.75 0.240(32) Y(1) 296 0.5 0.5 0
0.75 0.072(12) Tl(2) 296 0 0 0.15
0.75 -- Cu 296 0 0 0.1373(15)
0.75 -- O(1) 296 0 0 0.1334(52)
0.75 -- O(2) 296 0 0 0.3318(75)
0.75 -- O(3) 296 0.5 0.5 0.4795
1 0.896(3) Tl(1) 296 0 0 0.5
1 0.896(3) Pb 296 0 0 0.5
1 0.992(19) Sr(1) 296 0.5 0.5 0.2856(8)
1 -- Y(2) 296 0.5 0.5 0
1 0.020(37) Ca(2) 296 0.5 0.5 0
1 0.985(44) Ca(1) 296 0.5 0.5 0
1 -- Y(1) 296 0.5 0.5 0
1 0.105(8) Tl(2) 296 0 0 0.5
1 -- Cu 296 0 0 0.1379(10)
1 -- O(1) 296 0.5 0 0.1320(52)
1 -- O(2) 296 0 0 0.3316(52)
1 -- O(3) 296 0.5 0.5 0.4763
Measurement Method: X-ray diffraction
"We have carried out a detailed analysis of the X-ray diffraction profiles making use of the data collected with a STOE automatic powder diffractometer using a germanium (111) monochromated CuKα1 (... =1.54056 σ) operating on a linear PSD in the transmission mode. X-ray absorption spectra were recorded with a Rigaku spectrometer fitted with a 12 kW rotating anode X-ray generator (Cu target) and a Si (440) monochromatising crystal."

Cautions: Evaluated Data