Material Specification for Hg:121; [Hg-Ba-Cu-O]
Process: Solid State Reaction
Notes: "The bulk samples were prepared by solid state reaction between stoichiometric mixtures of yellow HgO and precursor powders of Ba2CuO3. The precursor Ba2CuO3 was obtained by solid state reaction of stoichiometric quantities of BaO and CuO in air at 900 °C for 48 h with one intermittent grinding and pressing into pellets. The black precursor powders obtained were taken immediately into a dry box, where powders of HgO and Ba2CuO3 were ground well and pressed into a pellet. The pellet (3 mm diameter, 10 mm length) was then introduced into a quartz tube, evacuated and sealed. The sealed quartz capsule (6 mm ID x 11 mm OD x 150 mm length) was placed in a long horizontal steel tube which was kept inside a furnace. The sides of the steel tube were packed with Ag powder (to contain Hg vapors if the tube were to explode) and quartz wool. The samples were heated slowly to 800 °C in 3-4 h, held at 800 °C for 5 h, and then slowly cooled to room temperature in 5-6 h.
Formula: HgBa2CuO4+x
Informal Name: Hg:121
Chemical Family: Hg-Ba-Cu-O
Chemical Class: Oxide
Structure Type: Polycrystalline
Manufacturer: In House
Commercial Name: In House
Production Date:
Lot Number:
Production Form:
Density (mass) for Hg:121; [Hg-Ba-Cu-O]
| Theoretical Density (g cm-3) |
Density (g cm-3) |
| 7.05 |
5.36 |
Measurement Method: X-ray diffraction
"The structure of the material was established via X-ray diffraction. A sample was prepared by powdering a chip from the bulk, dispersing it in toluene, and depositing a thin portion on a Si substrate. A Phillips Model XRG3100 diffractometer with CuKα radiation was used to perform the X-ray analysis."
Cautions: Evaluated Data
Crystallography for Hg:121; [Hg-Ba-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | |
| Space Group: |
P4/mmm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
3.876(2) |
-- |
9.515(3) |
Measurement Method: X-ray diffraction
"The structure of the material was established via X-ray diffraction. A sample was prepared by powdering a chip from the bulk, dispersing it in toluene, and depositing a thin portion on a Si substrate. A Phillips Model XRG3100 diffractometer with CuKα radiation was used to perform the X-ray analysis."
Cautions: Evaluated Data
Critical Temperature for Hg:121; [Hg-Ba-Cu-O]
| Critical Temperature (K) |
| 95 |
Measurement Method: SQUID magnetometer
"Magnetic characterization of the... material was conducted using a SQUID-based magnetometer (Quantum Design MPMS-7). The instrument was equipped with a high homogeneity 7 T magnet and with a sample scan length of 4 cm, maintaining the sample in a highly homogeneous magnetic field. The specimen (mass=253 mg) was cylindrical with a diameter of 3.2 mm and a length of 5.8 mm... The magnetic field was applied parallel to the cylinder axis."
Cautions: Evaluated Data
Magnetic Susceptibility for Hg:121; [Hg-Ba-Cu-O]
| Cooling Method () |
Magnetic Field (mT) |
Temperature (K) |
Magnetic Susceptibility (arbitrary) |
| FC |
1.5 |
4 |
-0.028 |
| FC |
1.5 |
30 |
-0.027 |
| FC |
1.5 |
58 |
-0.027 |
| FC |
1.5 |
83 |
-0.027 |
| FC |
1.5 |
93 |
-0.021 |
| FC |
1.5 |
95 |
-0.008 |
| FC |
1.5 |
97 |
0 |
| FC |
1.5 |
101 |
0 |
| ZFC |
0.4 |
5 |
-0.099 |
| ZFC |
0.4 |
21 |
-0.098 |
| ZFC |
0.4 |
40 |
-0.099 |
| ZFC |
0.4 |
64 |
-0.098 |
| ZFC |
0.4 |
78 |
-0.096 |
| ZFC |
0.4 |
89 |
-0.070 |
| ZFC |
0.4 |
93 |
-0.033 |
| ZFC |
0.4 |
97 |
0 |
| ZFC |
0.4 |
101 |
0 |
| ZFC |
1.0 |
5 |
-0.097 |
| ZFC |
1.0 |
36 |
-0.097 |
| ZFC |
1.0 |
59 |
-0.094 |
| ZFC |
1.0 |
76 |
-0.082 |
| ZFC |
1.0 |
85 |
-0.052 |
| ZFC |
1.0 |
90 |
-0.033 |
| ZFC |
1.0 |
95 |
-0.024 |
| ZFC |
1.0 |
96 |
-0.013 |
| ZFC |
1.0 |
97 |
0 |
| ZFC |
1.0 |
101 |
0 |
| ZFC |
1.5 |
5 |
-0.097 |
| ZFC |
1.5 |
30 |
-0.096 |
| ZFC |
1.5 |
48 |
-0.092 |
| ZFC |
1.5 |
65 |
-0.083 |
| ZFC |
1.5 |
77 |
-0.064 |
| ZFC |
1.5 |
82 |
-0.046 |
| ZFC |
1.5 |
86 |
-0.038 |
| ZFC |
1.5 |
94 |
-0.028 |
| ZFC |
1.5 |
96 |
-0.013 |
| ZFC |
1.5 |
97 |
0 |
| ZFC |
1.5 |
101 |
0 |
| ZFC |
2.0 |
5 |
-0.097 |
| ZFC |
2.0 |
21 |
-0.095 |
| ZFC |
2.0 |
35 |
-0.092 |
| ZFC |
2.0 |
55 |
-0.083 |
| ZFC |
2.0 |
70 |
-0.061 |
| ZFC |
2.0 |
81 |
-0.040 |
| ZFC |
2.0 |
92 |
-0.031 |
| ZFC |
2.0 |
95 |
-0.019 |
| ZFC |
2.0 |
96 |
-0.006 |
| ZFC |
2.0 |
97 |
0 |
| ZFC |
2.0 |
101 |
0 |
Measurement Method: SQUID magnetometer
"Magnetic characterization of the... material was conducted using a SQUID-based magnetometer (Quantum Design MPMS-7). The instrument was equipped with a high homogeneity 7 T magnet and with a sample scan length of 4 cm, maintaining the sample in a highly homogeneous magnetic field. The specimen (mass=253 mg) was cylindrical with a diameter of 3.2 mm and a length of 5.8 mm... The magnetic field was applied parallel to the cylinder axis."
Cautions: Evaluated Data
Digitized data were obtained from Figure 2 of the paper.
