Abstract
Crystal structures of HgBa2CaCu2O6+δ (Hg-1212) and HgBa2Ca2Cu3O8+δ (Hg-1223) have been determined on single crystals at room temperature conditions by X-ray diffraction techniques. Both tetragonal specimens are isomorphous with compounds in the Tl-Ba-Ca-Cu-O system. We observe excess oxygen in both samples on two sites near the z=0 plane: at ( 1 200) and close to ( 1 2, 0.4, 0) - but no oxygen at ( 1 2 1 20) as reported in earlier studies. Refined Hg occupancies for both samples indicate a substitution of Cu for Hg of more than ten percent. If the substitution of Cu for Hg and excess O at ( 1 200) are coupled, then the effect is to insert a perovskite-like six-coordinated copper site at (000). No evidence was found for a split atom at the barium sites in these compounds.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 216-221 |
| Number of pages | 6 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 226 |
| Issue number | 3-4 |
| DOIs | |
| State | Published - Jun 10 1994 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Crystal chemistry of HgBa2CaCu2O8+δ and HgBa2Ca2Cu3O8+δ single-crystal x-ray diffraction results. / Finger, L. W.; Hazen, R. M.; Downs, Robert T; Meng, R. L.; Chu, C. W.
In: Physica C: Superconductivity and its Applications, Vol. 226, No. 3-4, 10.06.1994, p. 216-221.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Crystal chemistry of HgBa2CaCu2O8+δ and HgBa2Ca2Cu3O8+δ single-crystal x-ray diffraction results
AU - Finger, L. W.
AU - Hazen, R. M.
AU - Downs, Robert T
AU - Meng, R. L.
AU - Chu, C. W.
PY - 1994/6/10
Y1 - 1994/6/10
N2 - Crystal structures of HgBa2CaCu2O6+δ (Hg-1212) and HgBa2Ca2Cu3O8+δ (Hg-1223) have been determined on single crystals at room temperature conditions by X-ray diffraction techniques. Both tetragonal specimens are isomorphous with compounds in the Tl-Ba-Ca-Cu-O system. We observe excess oxygen in both samples on two sites near the z=0 plane: at ( 1 200) and close to ( 1 2, 0.4, 0) - but no oxygen at ( 1 2 1 20) as reported in earlier studies. Refined Hg occupancies for both samples indicate a substitution of Cu for Hg of more than ten percent. If the substitution of Cu for Hg and excess O at ( 1 200) are coupled, then the effect is to insert a perovskite-like six-coordinated copper site at (000). No evidence was found for a split atom at the barium sites in these compounds.
AB - Crystal structures of HgBa2CaCu2O6+δ (Hg-1212) and HgBa2Ca2Cu3O8+δ (Hg-1223) have been determined on single crystals at room temperature conditions by X-ray diffraction techniques. Both tetragonal specimens are isomorphous with compounds in the Tl-Ba-Ca-Cu-O system. We observe excess oxygen in both samples on two sites near the z=0 plane: at ( 1 200) and close to ( 1 2, 0.4, 0) - but no oxygen at ( 1 2 1 20) as reported in earlier studies. Refined Hg occupancies for both samples indicate a substitution of Cu for Hg of more than ten percent. If the substitution of Cu for Hg and excess O at ( 1 200) are coupled, then the effect is to insert a perovskite-like six-coordinated copper site at (000). No evidence was found for a split atom at the barium sites in these compounds.
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U2 - 10.1016/0921-4534(94)90197-X
DO - 10.1016/0921-4534(94)90197-X
M3 - Article
VL - 226
SP - 216
EP - 221
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 3-4
ER -