Material Specification for Tl:2223; [Tl-Ba-Ca-Cu-O]
Process: Solid State Reaction
Notes: "Single-phase BaCuO2 was synthesized by conventional solid state reaction from a stoichiometric mixture of BaCO3 and CuO (99.999%) at 900 °C for 48 h in air. Powders of Tl2O3 (99.99%), BaCuO2, CaO and CuO were thoroughly ground in an agate mortar with a nominal starting composition in the ratio of Tl:Ba:Ca:Cu=1.8:2:2.2:3... The reactant mixture was cold-pressed under (0.4 GPa = 4 kbar) into pellets with a diameter of 8 mm. The pellets were sealed inside a gold tube and calcined in a tube furnace under flowing oxygen at 890 °C for 6 h, after which the furnace was switched off and the samples allowed to cool slowly. The product was reground and split into three equal quantities, two of which were annealed; one in a flow of argon at 500 °C for 12 h (Ar-annealed), and the second under (50 MPa = 500 atm) of oxygen at 500 °C for 5 h (HPO-annealed); the remaining sample received no further treatment (As-prepared sample). All annealing states were followed by a slow cool under the respective atmosphere."
Formula: Tl2Ba2Ca2Cu3O10-y
Informal Name: Tl:2223
Chemical Family: Tl-Ba-Ca-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Tl:2223; [Tl-Ba-Ca-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
|
Cell Parameters
| Annealing Environment () |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| As-prepare |
298 |
3.85101(1) |
-- |
35.5824(1) |
| Oxygen |
298 |
3.85167(1) |
-- |
35.5647(1) |
| Argon |
298 |
3.85137(1) |
-- |
35.6429(1) |
Atomic Coordinates
| Annealing Environment () |
Atom |
Temp
K
|
a-axis |
b-axis |
c-axis |
| As-prepare |
Ca |
298 |
0.0 |
0.0 |
0.04624(7) |
| As-prepare |
Ba |
298 |
0.0 |
0.0 |
0.14474(7) |
| As-prepare |
Tl |
298 |
0.5 |
0.5 |
0.22038(5) |
| As-prepare |
Cu(1) |
298 |
0.5 |
0.5 |
0.0 |
| As-prepare |
Cu(2) |
298 |
0.5 |
0.5 |
0.08991(4) |
| As-prepare |
O(1) |
298 |
0.5 |
0.0 |
0.0 |
| As-prepare |
O(2) |
298 |
0.5 |
0.0 |
0.08820(5) |
| As-prepare |
O(3) |
298 |
0.5 |
0.5 |
0.16455(7) |
| As-prepare |
O(4) |
298 |
0.6112(12) |
0.5 |
0.2753(1) |
| Oxygen |
Ca |
298 |
0 |
0 |
0.04605(7) |
| Oxygen |
Ba |
298 |
0 |
0 |
0.14530(7) |
| Oxygen |
Tl |
298 |
0.5 |
0.5 |
0.22065(5) |
| Oxygen |
Cu(2) |
298 |
0.5 |
0.5 |
0.08982(4) |
| Oxygen |
O(2) |
298 |
0.5 |
0.0 |
0.08813(5) |
| Oxygen |
O(3) |
298 |
0.5 |
0.5 |
0.16451(8) |
| Oxygen |
O(4) |
298 |
0.6153(12) |
0.5 |
0.2754(1) |
| Argon |
Ca |
298 |
0.0 |
0.0 |
0.04627(6) |
| Argon |
Ba |
298 |
0.0 |
0.0 |
0.14458(6) |
| Argon |
Tl |
298 |
0.5 |
0.5 |
0.22018(4) |
| Argon |
Cu(1) |
298 |
0.5 |
0.5 |
0.0 |
| Argon |
Cu(2) |
298 |
0.5 |
0.5 |
0.08909(4) |
| Argon |
O(1) |
298 |
0.5 |
0.0 |
0.0 |
| Argon |
O(2) |
298 |
0.5 |
0.0 |
0.08786(4) |
| Argon |
O(3) |
298 |
0.5 |
0.5 |
0.16437(7) |
| Argon |
O(4) |
298 |
0.6010(10) |
0.5 |
0.2752(1) |
Measurement Method: Neutron diffraction
"Neutron diffraction data were collected on HRPD on ISIS at the Rutherford-Appleton Laboratory. Three separate runs, each of approximately 12 h duration and at 298 K, were carried out. Five g of each material was sealed inside a vanadium can and data were collected in backscattering at the 1 m position over the TOF region 30,000-110,000 µs corresponding to the d-spacing range 0.6216 σ to 2.2793 σ. The raw data were normalized and corrected for absorption."
Cautions: Evaluated Data
Magnetic Susceptibility for Tl:2223; [Tl-Ba-Ca-Cu-O]
| Annealing Environment () |
Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| As-prepared |
90 |
-0.014 |
| As-prepared |
95 |
-0.012 |
| As-prepared |
100 |
-0.011 |
| As-prepared |
105 |
-0.009 |
| As-prepared |
110 |
-0.007 |
| As-prepared |
113 |
-0.006 |
| As-prepared |
115 |
-0.004 |
| As-prepared |
116 |
-0.002 |
| As-prepared |
117 |
0 |
| As-prepared |
120 |
0 |
| Oxygen |
90 |
-0.017 |
| Oxygen |
95 |
-0.015 |
| Oxygen |
100 |
-0.014 |
| Oxygen |
105 |
-0.012 |
| Oxygen |
110 |
-0.010 |
| Oxygen |
113 |
-0.006 |
| Oxygen |
114 |
-0.003 |
| Oxygen |
115 |
0 |
| Oxygen |
120 |
0 |
| Argon |
90 |
-0.007 |
| Argon |
95 |
-0.007 |
| Argon |
100 |
-0.006 |
| Argon |
103 |
-0.005 |
| Argon |
105 |
-0.004 |
| Argon |
107 |
-0.002 |
| Argon |
108 |
-0.001 |
| Argon |
109 |
0 |
| Argon |
110 |
0 |
Measurement Method: Susceptibility method
"The superconducting nature of the samples was measured using an Oxford Instruments VSM with a 5 mT applied field taking 0.2 K temperature steps." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 3 of the paper.
