Material Specification for Y:123; [Y(Ca)-Ba-Cu(Hg)-O]
Process: Solid State Reaction
Notes: "The... compound was prepared from mixtures of the "123" phase YBa2Cu3O7 and of the oxides CaO, BaO2, CuO and HgO intimately ground in an agate mortar, and heated in a quartz tube very slowly (in about 12 h) up to 800 °C; after a plateau of several hours at the latter temperature (ranging from 5 to 8 h), the products were slowly cooled (in about 12 h) down to room temperature. Several thermal cycles with intermediate regrindings were necessary to obtain a pure phase."
Formula: Y0.6Ca0.4+x-yBa2Cu2+yHg1-xO6+z
Informal Name: Y:123
Chemical Family: Y(Ca)-Ba-Cu(Hg)-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for Y:123; [Y(Ca)-Ba-Cu(Hg)-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
P4/mmm
|
Cell Parameters
| x of Hg1-x (formula units) |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 0.4 |
296 |
3.870(1) |
-- |
12.537(1) |
Atomic Coordinates
| x of Hg1-x (formula units) |
Atom |
Temp
K
|
a-axis |
b-axis |
c-axis |
| 0.4 |
Hg |
296 |
0 |
0 |
0 |
| 0.4 |
Ba |
296 |
0.5 |
0.5 |
0.2137(3) |
| 0.4 |
Y,Ca |
296 |
0.5 |
0.5 |
0.5 |
| 0.4 |
Cu |
296 |
0 |
0 |
0.3728(3) |
| 0.4 |
O(1) |
296 |
0 |
0 |
0.163(3) |
| 0.4 |
O(2) |
296 |
0 |
0.5 |
0.385(2) |
| 0.4 |
O(3) |
296 |
0.5 |
0.5 |
0 |
Measurement Method: X-ray diffraction
"X-ray diffraction data were collected by means of a Seifert vertical diffractometer equipped with a primary monochromator in order to select the CuKα1 radiation. To minimize possible preferred orientation phenomena, powder was deposited on grease in a rotating sample holder. Data were collected in the range 14° ≤2θ ≤90° by step scanning with increments of 0.02° (2θ) and a preset time of 10 s. Lattice constants and structure were calculated using a Rietveld method (program dbw 3.2)."
Cautions: Evaluated Data
Critical Temperature for Y:123; [Y(Ca)-Ba-Cu(Hg)-O]
| x of Hg1-x (formula units) |
Critical Temperature (K) |
| 0.4 |
80 |
| 0.5 |
90 |
Measurement Method: SQUID magnetometer
"The superconducting properties were studied on sintered materials as a function of temperature down to 4.2 K using a Quantum Design magnetometer with an applied field of (1 mT = 10 G) in zero-field cooled (ZFC) mode. No demagnetization corrections were made."
Cautions: Evaluated Data
Magnetic Susceptibility for Y:123; [Y(Ca)-Ba-Cu(Hg)-O]
| x of Hg1-x (formula units) |
Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| 0.4 |
9 |
-0.21 |
| 0.4 |
19 |
-0.19 |
| 0.4 |
29 |
-0.16 |
| 0.4 |
40 |
-0.12 |
| 0.4 |
50 |
-0.09 |
| 0.4 |
59 |
-0.05 |
| 0.4 |
69 |
-0.02 |
| 0.4 |
74 |
-0.01 |
| 0.4 |
79 |
0.00 |
| 0.5 |
10 |
-0.27 |
| 0.5 |
20 |
-0.26 |
| 0.5 |
29 |
-0.25 |
| 0.5 |
39 |
-0.22 |
| 0.5 |
50 |
-0.18 |
| 0.5 |
60 |
-0.14 |
| 0.5 |
70 |
-0.07 |
| 0.5 |
74 |
-0.04 |
| 0.5 |
80 |
-0.02 |
| 0.5 |
84 |
-0.01 |
| 0.5 |
89 |
0.00 |
Measurement Method: SQUID magnetometer
"The superconducting properties were studied on sintered materials as a function of temperature down to 4.2 K using a Quantum Design magnetometer with an applied field of (1 mT = 10 G) in zero-field cooled (ZFC) mode. No demagnetization corrections were made."
Cautions: Evaluated Data
Digitized data were obtained from Figure 6 of the paper.
