Material Specification for Hg:1223; [Hg-Ba-Ca-Cu-O]
Process: Solid State Reaction
Notes: "Powder samples... were obtained by high-pressure and high-temperature reactions using the belt-type apparatus of the Laboratoire de Cristallographie. A precursor with the nominal composition Ba2Ca2Cu3Ox was prepared by mixing high-purity nitrates: Ba(NO3)2 (Aldrich, >99%), Ca(NO3)O2 4H2O (Normapur Prolabo, analytical reagent) and Cu(NO3)2 3H2O (Stream Chemical Inc., 99.5%). The mixture thus obtained was initially heated at 600 °C in air for 12 h, then (reground) and annealed at 925 °C for 72 h in an oxygen flow with three intermediate regrindings. Then, the stoichiometric amount of yellow HgO (Aldrich, >99%) was added and the mixture was thoroughly ground in an agate mortar and sealed in a Pt capsule specific for high pressure synthesis... In these experiments the pressure was first increased to (5 GPa = 50 kbar) subsequently the temperature was raised to the desired value during 1 h, then the temperature and the pressure were kept constant for 1-4 h. After this, the furnace power was shut off and the pressure decreased to normal conditions in 30 min."
Formula: HgBa2Ca2Cu3O8+x
Informal Name: Hg:1223
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:1223; [Hg-Ba-Ca-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | 1 |
| Space Group: |
P4/mmm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
3.8532(6) |
-- |
15.818(2) |
Measurement Method: X-ray diffraction
"The samples were studied by X-ray powder diffraction, performed with a Guinier focusing camera and FeKα radiation (1.93730 σ). Finely powdered silicon (a=5.43088 σ at 25 °C) was used as an internal standard. The intensities of the reflections were evaluated by an automatic film scanner. The SCAN3 and SCANPI programs were used for processing the data."
Cautions: Evaluated Data
Critical Temperature for Hg:1223; [Hg-Ba-Ca-Cu-O]
| Critical Temperature (K) |
| 133 |
Measurement Method: Ac susceptibility
"The AC susceptibility was measured with an alternating maximum field of (0.8 A/m = 0.01 Oe) and a frequency of 119 Hz. The temperature was measured by a calibrated 100 Ω platinum thermometer."
Cautions: Evaluated Data
Magnetic Susceptibility for Hg:1223; [Hg-Ba-Ca-Cu-O]
| Temperature (°C) |
Magnetic Susceptibility (arbitrary) |
| 18 |
-14.7 |
| 51 |
-13.2 |
| 74 |
-10.9 |
| 99 |
- 8.0 |
| 119 |
- 4.6 |
| 131 |
- 2.6 |
| 135 |
- 0.2 |
| 136 |
- 0.1 |
| 149 |
0 |
Measurement Method: Ac susceptibility
"The AC susceptibility was measured with an alternating maximum field of (0.8 A/m = 0.01 Oe) and a frequency of 119 Hz. The temperature was measured by a calibrated 100 Ω platinum thermometer."
Cautions: Evaluated Data
Digitized data were obtained from Figure 7 of the paper.
Material Specification for Hg:1234; [Hg-Ba-Ca-Cu-O]
Process: Solid State Reaction
Notes: "Powder samples... were obtained by high-pressure and high-temperature reactions using the belt-type apparatus of the Laboratoire de Cristallographie. A precursor with the nominal composition Ba2Ca2Cu3Ox was prepared by mixing high-purity nitrates: Ba(NO3)2 (Aldrich, >99%), Ca(NO3)O2 4H2O (Normapur Prolabo, analytical reagent) and Cu(NO3)2 3H2O (Stream Chemical Inc., 99.5%). The mixture thus obtained was initially heated at 600 °C in air for 12 h, then (reground) and annealed at 925 °C for 72 h in an oxygen flow with three intermediate regrindings. Then, the stoichiometric amount of yellow HgO (Aldrich, >99%) was added and the mixture was thoroughly ground in an agate mortar and sealed in a Pt capsule specific for high pressure synthesis... In these experiments the pressure was first increased to (5 GPa = 50 kbar) subsequently the temperature was raised to the desired value during 1 h, then the temperature and the pressure were kept constant for 1-4 h. After this, the furnace power was shut off and the pressure decreased to normal conditions in 30 min."
Formula: HgBa2Ca3Cu4O10+x
Informal Name: Hg:1234
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:1234; [Hg-Ba-Ca-Cu-O]
| Crystal System: | Tetragonal |
| Formula Units per Cell: | 1 |
| Space Group: |
P4/mmm
|
Cell Parameters
|
Temp
K
|
a
Å
|
b
Å
|
c
Å
|
| 296 |
3.8540(3) |
-- |
19.006(3) |
Measurement Method: X-ray diffraction
"The samples were studied by X-ray powder diffraction, performed with a Guinier focusing camera and FeKα radiation (1.93730 σ). Finely powdered silicon (a=5.43088 σ at 25 °C) was used as an internal standard. The intensities of the reflections were evaluated by an automatic film scanner. The SCAN3 and SCANPI programs were used for processing the data."
Cautions: Evaluated Data
Critical Temperature for Hg:1234; [Hg-Ba-Ca-Cu-O]
| Critical Temperature (K) |
| 126 |
Measurement Method: Ac susceptibility
"The AC susceptibility was measured with an alternating maximum field of (0.8 A/m = 0.01 Oe) and a frequency of 119 Hz. The temperature was measured by a calibrated 100 Ω platinum thermometer."
Cautions: Evaluated Data
"Actually, two onsets at two different temperatures are visible, the smaller one at 132 K and the larger one at about 126 K. There are two Hg-based layered cuprates in this sample: Hg-1234 as the main phase and Hg-1223 as the minority one. ...we might suggest that the first onset (132 K) corresponds to Hg-1223 and the larger one at the lower temperature (126 K) to Hg-1234."
Magnetic Susceptibility for Hg:1234; [Hg-Ba-Ca-Cu-O]
| Temperature (°C) |
Magnetic Susceptibility (arbitrary) |
| 12 |
-10.1 |
| 47 |
- 9.6 |
| 80 |
- 8.7 |
| 98 |
- 7.3 |
| 107 |
- 6.1 |
| 119 |
- 3.2 |
| 129 |
- 0.4 |
| 132 |
- 0.1 |
| 148 |
0 |
Measurement Method: Ac susceptibility
"The AC susceptibility was measured with an alternating maximum field of (0.8 A/m = 0.01 Oe) and a frequency of 119 Hz. The temperature was measured by a calibrated 100 Ω platinum thermometer."
Cautions: Evaluated Data
Digitized data were obtained from Figure 8 of the paper.
