Material Specification for Hg:1212; [Hg-Ba-Ca-Cu-O]
Process: Solid State Reaction
Notes: "The samples examined were synthesized, following the two step solid state reaction technique... A precursor material with a nominal composition... was prepared by calcinating at 900 °C a thoroughly mixed powder of appropriate amounts of BaCuO2 and CaO in a oxygen atmosphere for 16 h. The calcined powder was then mixed with HgO powder in the proportion of 1:1 for Hg-1212, and compacted into pellets which were sealed in evacuated quartz tubes. The quartz tubes were, in turn, sealed in stainless steel tubes. They were subsequently placed inside a furnace and slowly heated at a rate of (about) 160 °C/h to 800 °C and stayed at this temperature for 9 h before being cooled to room temperature... Finally, the pellets were repeatedly annealed at 300 °C in flowing oxygen at (0.1 MPa = 1 bar) of pressure. It should be noted that throughout our sample preparation, exposure of the material to air was kept to a minimum."
Formula: HgBa2CaCu2O6+x
Informal Name: Hg:1212
Chemical Family: Hg-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 Hg:1212; [Hg-Ba-Ca-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
P4/mmm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
3.862(1) |
-- |
12.707(5) |
Measurement Method: X-ray diffraction
"Structure characterization was carried out by X-ray diffraction... using the Rigaku D-MAX III powder diffractometer..." No additional measurement details were noted.
Cautions: Evaluated Data
Critical Temperature for Hg:1212; [Hg-Ba-Ca-Cu-O]
| Critical Temperature (K) |
| 112 ± 1 |
Measurement Method: SQUID magnetometer
"... a Quantum Design SQUID magnetometer was employed to measure the magnetization... DC magnetic susceptibility... (was) measured (0.4 kA/m = 5 Oe)... for a sample which has undergone repeated annealing in flowing oxygen at 300 °C, in both the field cooled (FC) and zero field cooled (ZFC) modes."
Cautions: Evaluated Data
Resistance (normal state) for Hg:1212; [Hg-Ba-Ca-Cu-O]
| Temperature (K) |
Resistance (normal state) (mΩ) |
| 106 |
0 |
| 110 |
300 |
| 113 |
1700 |
| 115 |
3000 |
| 117 |
3400 |
| 122 |
3600 |
| 130 |
3900 |
Measurement Method: Four-probe method
"Bar samples were cut from these HBCCO pellets ... The standard four lead technique was used to determine the resistance..." No additional measurement details were noted.
Cautions: Unevaluated Data
Digitized data were obtained from Figure 7 of the paper.
Magnetic Susceptibility for Hg:1212; [Hg-Ba-Ca-Cu-O]
| Cooling Mode () |
Annealing Time () |
Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| FC |
0 |
10 |
-2.2 |
| FC |
0 |
40 |
-2.2 |
| FC |
0 |
60 |
-2.2 |
| FC |
0 |
70 |
-2.0 |
| FC |
0 |
93 |
-1.8 |
| FC |
0 |
109 |
-1.4 |
| FC |
0 |
111 |
-0.4 |
| FC |
0 |
114 |
0 |
| FC |
0 |
130 |
0 |
| FC |
0 |
150 |
0 |
| FC |
5 |
9 |
-4.0 |
| FC |
5 |
40 |
-4.0 |
| FC |
5 |
71 |
-3.7 |
| FC |
5 |
94 |
-3.2 |
| FC |
5 |
106 |
-2.3 |
| FC |
5 |
111 |
-1.2 |
| FC |
5 |
119 |
-0.2 |
| FC |
5 |
125 |
0 |
| FC |
5 |
150 |
0 |
| FC |
15 |
11 |
-3.5 |
| FC |
15 |
50 |
-3.5 |
| FC |
15 |
80 |
-3.2 |
| FC |
15 |
105 |
-2.6 |
| FC |
15 |
112 |
-1.6 |
| FC |
15 |
117 |
-0.5 |
| FC |
15 |
125 |
0.0 |
| FC |
15 |
150 |
0.0 |
| FC |
25 |
10 |
-3.5 |
| FC |
25 |
40 |
-3.5 |
| FC |
25 |
80 |
-3.2 |
| FC |
25 |
105 |
-2.6 |
| FC |
25 |
113 |
-1.7 |
| FC |
25 |
117 |
-0.6 |
| FC |
25 |
120 |
-0.2 |
| FC |
25 |
125 |
0.0 |
| FC |
25 |
150 |
0.0 |
| ZFC |
0 |
11 |
-6.0 |
| ZFC |
0 |
30 |
-5.5 |
| ZFC |
0 |
51 |
-5.0 |
| ZFC |
0 |
70 |
-4.4 |
| ZFC |
0 |
102 |
-3.7 |
| ZFC |
0 |
111 |
-2.9 |
| ZFC |
0 |
112 |
-0.6 |
| ZFC |
0 |
114 |
0 |
| ZFC |
0 |
134 |
0 |
| ZFC |
0 |
151 |
0 |
| ZFC |
5 |
10 |
-6.0 |
| ZFC |
5 |
30 |
-6.0 |
| ZFC |
5 |
54 |
-5.8 |
| ZFC |
5 |
80 |
-5.1 |
| ZFC |
5 |
100 |
-4.2 |
| ZFC |
5 |
110 |
-2.7 |
| ZFC |
5 |
116 |
-0.6 |
| ZFC |
5 |
126 |
0 |
| ZFC |
5 |
151 |
0 |
| ZFC |
15 |
10 |
-5.5 |
| ZFC |
15 |
40 |
-5.4 |
| ZFC |
15 |
80 |
-4.8 |
| ZFC |
15 |
100 |
-4.1 |
| ZFC |
15 |
111 |
-3.0 |
| ZFC |
15 |
115 |
-1.8 |
| ZFC |
15 |
118 |
-0.6 |
| ZFC |
15 |
126 |
0 |
| ZFC |
15 |
151 |
0 |
| ZFC |
25 |
10 |
-5.7 |
| ZFC |
25 |
49 |
-5.5 |
| ZFC |
25 |
84 |
-5.0 |
| ZFC |
25 |
109 |
-3.8 |
| ZFC |
25 |
115 |
-2.0 |
| ZFC |
25 |
117 |
-0.6 |
| ZFC |
25 |
120 |
-0.2 |
| ZFC |
25 |
126 |
0 |
| ZFC |
25 |
151 |
0 |
Measurement Method: SQUID magnetometer
"... a Quantum Design SQUID magnetometer was employed to measure the magnetization... DC magnetic susceptibility... (was) measured (0.4 kA/m = 5 Oe)... for a sample which has undergone repeated annealing in flowing oxygen at 300 °C, in both the field cooled (FC) and zero field cooled (ZFC) modes."
Cautions: Evaluated Data
Digitized data were obtained from Figure 4 and 5 of the paper.
