Material Specification for PbSr:1212; [Pb(Hg)-Sr-Y(Ca)-Cu-O]
Process: Solid State Reaction
Notes: "High-purity powders of PbO, HgO, SrO2, CaO, Y2O3 and CuO were weighed in the appropriate proportions to form nominal compositions... The powders were then mixed using a mortar and pestle and pressed into pellets (10 mm in diameter and 3 mm in thickness) under a pressure of 5 ton/cm2. The pellets were wrapped in gold foil to prevent loss of lead and mercury and a possible reaction with quartz at elevated temperatures, then encapsulated in an evacuated (oxygen pressure (of about 0.013 Pa = 10-4 torr) ) quartz tube. Subsequently, the samples were heated inside of a furnace at a heating rate of 10 °C/min up to 970 °C for 24 hr, and then cooled down to room temperature at a cooling rate of 2 °C/min. After heat treatment, all samples were black. Bar-shaped specimens (1.5 mm x 2 mm x 10 mm) were cut from the sintered pellets and used for resistivity measurements."
Formula: Pb0.5Hg0.5Sr2YxCa1-xCu2O7-y
Informal Name: PbSr:1212
Chemical Family: Pb(Hg)-Sr-Y(Ca)-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Crystallography for PbSr:1212; [Pb(Hg)-Sr-Y(Ca)-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
P4/mmm
|
Cell Parameters
| x of yx (formula units) |
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 0.2 |
296 |
3.8083 |
-- |
12.022 |
| 0.3 |
296 |
3.8089 |
-- |
12.016 |
| 0.4 |
296 |
3.8100 |
-- |
12.000 |
| 0.5 |
296 |
3.8158 |
-- |
11.951 |
Measurement Method: X-ray diffraction
"X-ray diffraction (XRD) analyses were performed using a Philips PW1710 X-ray diffractometer with CuKα radiation." No additional measurement details were noted.
Cautions: Evaluated Data
Digitized data were obtained from Figure 3a and 3b of the paper.
Critical Temperature for PbSr:1212; [Pb(Hg)-Sr-Y(Ca)-Cu-O]
| x of Yx (formula units) |
Critical Temperature (K) |
| 0.3 |
90 |
Measurement Method: SQUID magnetometer
"Low field magnetization data were taken from a superconducting quantum interference device (SQUID) magnetometer (Quantum Design)." The authors indicated that specimens were field cooled in 796 A/m (10 Oe), and data were obtained in an applied field of 1 mT (10 G).
Cautions: Evaluated Data
Digitized data were obtained from Figure 5 (inset) of the paper.
Magnetic Susceptibility for PbSr:1212; [Pb(Hg)-Sr-Y(Ca)-Cu-O]
| x of Yx (formula units) |
Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| 0.3 |
5 |
-0.0234 |
| 0.3 |
15 |
-0.0232 |
| 0.3 |
30 |
-0.0217 |
| 0.3 |
45 |
-0.0199 |
| 0.3 |
60 |
-0.0160 |
| 0.3 |
70 |
-0.0121 |
| 0.3 |
75 |
-0.0095 |
| 0.3 |
82 |
-0.0046 |
| 0.3 |
84 |
-0.0028 |
| 0.3 |
86 |
-0.0011 |
| 0.3 |
88 |
-0.0001 |
| 0.3 |
90 |
0.0 |
Measurement Method: SQUID magnetometer
"Low field magnetization data were taken from a superconducting quantum interference device (SQUID) magnetometer (Quantum Design)." The authors indicated that specimens were field cooled in 796 A/m (10 Oe), and data were obtained in an applied field of 1 mT (10 G).
Cautions: Evaluated Data
Digitized data were obtained from Figure 5 of the paper.
