NIST High Temp. Superconducting Materials (HTS) Database:

NIST Standard Reference Database 62

Last Update to Data Content: 1996

DOI: https://doi.org/10.18434/T4KP8J


Bibliographic Information

Title: Compressibility of the HgBa2Ca Cu O2N+2+δ(n=1,2,3) High-Temperature Superconductors
Author(s): J.H. Eggert, J.Z. Hu, H.K. Mao, L. Beauvais, R.L. Meng, and C.W. Chu
Publication: Physical Review B Volume: 49 Issue: 21 Year: 1994 Page(s): 15299-15304
Editor(s): Not Available
Publisher: American Physical Society
Language: English
Notes: Not Available
Keywords: Material Specification, Crystallography

Materials and Properties

Hg:121; [Hg-Ba-Cu-O]
Hg:1212; [Hg-Ba-Ca-Cu-O]
Hg:1223; [Hg-Ba-Ca-Cu-O]
Material Specification for Hg:121; [Hg-Ba-Cu-O] Process: Solid State Reaction
Notes: The authors cite R.L. Meng et al., Physica C 216, 21 (1993), and summarize the procedure as follows. "The samples were prepared using the controlled vapor-solid reaction technique by heating a precursor pellet of Ba2Ca Cu Ox (not a compound) and a composite Hg source together in an evacuated quartz tube. The precursor pellets were prepared by heating and drying an aqueous solution of appropriate amounts of Ba(NO3)2, Ca(NO3)2·4H2O and Cu(NO3)2·3H2O up to 620 °C in a beaker. The resulting black mixture was then ground, compacted, and sintered in flowing oxygen at 900 °C for 24 h to 48 h in an alumina crucible. These precursor pellets were pulverized, thoroughly mixed with HgO, and compacted (in a glove bag) to form the composite Hg source (prereacted HgBa2Ca Cu Ox). A small precursor pellet and a large composite Hg source (in a ratio of about 1/3) were sealed in an evacuated quartz tube, heated to 810-850 °C and kept at this temperature for 3-5 h before cooling to room temperature. The HgBa2Ca Cu Cu O2n+2+δ pellets were finally heated at 300 °C in flowing oxygen for 10 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:

Crystallography for Hg:121; [Hg-Ba-Cu-O]
Crystal System: Tetragonal
Formula Units per Cell:
Space Group:
Cell Parameters
Pressure (GPa) Temp K a Å b Å c Å
0 300 3.8778(14) -- 9.516(5)
5 300 3.803 -- 9.256
10 300 3.751 -- 9.045
15 300 3.716 -- 8.849
20 300 3.680 -- 8.670
25 300 3.661 -- 8.522
Measurement Method: X-ray diffraction
"High pressure was generated in three separate, diamond-anvil cells employing 1/3 carat diamond anvils with 400-600 µm central flats. The specimen was placed along with a small ruby chip into a 200 µm diameter hole in a preindented 60 µm thick stainless-steel gasket. The sample chamber was filled with neon at 0.2 GPa and sealed between the two diamond anvils. Fluid neon is rigorously hyrostatic up to 5 GPa above which it freezes into a soft quasihydrostatic pressure medium. Pressure was determined by the ruby-fluorescence method... All measurements were performed at 300 K. The energy-dispersive x-ray diffraction patterns at fixed angle were collected on the superconducting-wiggler beamline X17c at the National Synchrotron Light Source, Brookhaven National Laboratory. We used an intrinsic-germanium solid-state detector calibrated with several metal foil fluorescence standards excited by an Americium source. ... For all measurements reported here 2θ was 13.006° except for the ambient pressure Hg1223 sample which was obtained at 15.040°."

Cautions: Evaluated Data
Digitized data were obtained from Figure 3a and 3b of the paper.
Material Specification for Hg:1212; [Hg-Ba-Ca-Cu-O] Process: Solid State Reaction
Notes: The authors cite R.L. Meng et al., Physica C 216, 21 (1993), and summarize the procedure as follows. "The samples were prepared using the controlled vapor-solid reaction technique by heating a precursor pellet of Ba2Ca Cu Ox (not a compound) and a composite Hg source together in an evacuated quartz tube. The precursor pellets were prepared by heating and drying an aqueous solution of appropriate amounts of Ba(NO3)2, Ca(NO3)2·4H2O and Cu(NO3)2·3H2O up to 620 °C in a beaker. The resulting black mixture was then ground, compacted, and sintered in flowing oxygen at 900 °C for 24 h to 48 h in an alumina crucible. These precursor pellets were pulverized, thoroughly mixed with HgO, and compacted (in a glove bag) to form the composite Hg source (prereacted HgBa2Ca Cu Ox). A small precursor pellet and a large composite Hg source (in a ratio of about 1/3) were sealed in an evacuated quartz tube, heated to 810-850 °C and kept at this temperature for 3-5 h before cooling to room temperature. The HgBa2Ca Cu Cu O2n+2+δ pellets were finally heated at 300 °C in flowing oxygen for 10 h."
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:
Cell Parameters
Pressure (GPa) Temp K a Å b Å c Å
0 300 3.8550(6) -- 12.609(17)
5 300 3.807 -- 12.308
10 300 3.771 -- 12.092
15 300 3.733 -- 11.961
20 300 3.707 -- 11.787
25 300 3.682 -- 11.677
Measurement Method: X-ray diffraction
"High pressure was generated in three separate, diamond-anvil cells employing 1/3 carat diamond anvils with 400-600 µm central flats. The specimen was placed along with a small ruby chip into a 200 µm diameter hole in a preindented 60 µm thick stainless-steel gasket. The sample chamber was filled with neon at 0.2 GPa and sealed between the two diamond anvils. Fluid neon is rigorously hyrostatic up to 5 GPa above which it freezes into a soft quasihydrostatic pressure medium. Pressure was determined by the ruby-fluorescence method... All measurements were performed at 300 K. The energy-dispersive x-ray diffraction patterns at fixed angle were collected on the superconducting-wiggler beamline X17c at the National Synchrotron Light Source, Brookhaven National Laboratory. We used an intrinsic-germanium solid-state detector calibrated with several metal foil fluorescence standards excited by an Americium source. ... For all measurements reported here 2θ was 13.006° except for the ambient pressure Hg1223 sample which was obtained at 15.040°."

Cautions: Evaluated Data
Digitized data were obtained from Figure 3a and 3b of the paper.
Material Specification for Hg:1223; [Hg-Ba-Ca-Cu-O] Process: Solid State Reaction
Notes: The authors cite R.L. Meng et al., Physica C 216, 21 (1993), and summarize the procedure as follows. "The samples were prepared using the controlled vapor-solid reaction technique by heating a precursor pellet of Ba2Ca Cu Ox (not a compound) and a composite Hg source together in an evacuated quartz tube. The precursor pellets were prepared by heating and drying an aqueous solution of appropriate amounts of Ba(NO3)2, Ca(NO3)2·4H2O and Cu(NO3)2·3H2O up to 620 °C in a beaker. The resulting black mixture was then ground, compacted, and sintered in flowing oxygen at 900 °C for 24 h to 48 h in an alumina crucible. These precursor pellets were pulverized, thoroughly mixed with HgO, and compacted (in a glove bag) to form the composite Hg source (prereacted HgBa2Ca Cu Ox). A small precursor pellet and a large composite Hg source (in a ratio of about 1/3) were sealed in an evacuated quartz tube, heated to 810-850 °C and kept at this temperature for 3-5 h before cooling to room temperature. The HgBa2Ca Cu Cu O2n+2+δ pellets were finally heated at 300 °C in flowing oxygen for 10 h."
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:
Space Group:
Cell Parameters
Pressure (GPa) Temp K a Å b Å c Å
0 300 3.8545(30) -- 15.742(32)
5 300 3.807 -- 15.310
10 300 3.768 -- 15.067
15 300 3.746 -- 14.770
20 300 3.727 -- 14.473
25 300 3.714 -- 14.230
Measurement Method: X-ray diffraction
"High pressure was generated in three separate, diamond-anvil cells employing 1/3 carat diamond anvils with 400-600 µm central flats. The specimen was placed along with a small ruby chip into a 200 µm diameter hole in a preindented 60 µm thick stainless-steel gasket. The sample chamber was filled with neon at 0.2 GPa and sealed between the two diamond anvils. Fluid neon is rigorously hyrostatic up to 5 GPa above which it freezes into a soft quasihydrostatic pressure medium. Pressure was determined by the ruby-fluorescence method... All measurements were performed at 300 K. The energy-dispersive x-ray diffraction patterns at fixed angle were collected on the superconducting-wiggler beamline X17c at the National Synchrotron Light Source, Brookhaven National Laboratory. We used an intrinsic-germanium solid-state detector calibrated with several metal foil fluorescence standards excited by an Americium source. ... For all measurements reported here 2θ was 13.006° except for the ambient pressure Hg1223 sample which was obtained at 15.040°."

Cautions: Evaluated Data
Digitized data were obtained from Figure 3a and 3b of the paper.