Compounds and phase relations in the SrO-CaO-CuO system under high pressure

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1997.7442· OSTI ID:570218

Kobayashi, Naoya; Hiroi, Zenji; Takano, Mikio ^[1]

---

1. Kyoto Univ. (Japan)

The phase relation in the ternary SrO-CaO-CuO system under high pressure has been studied by means of powder X-ray diffraction, electron diffraction, and high resolution electron microscopy. In the SrO-CuO system studied in a pressure and temperature range of 1.7-8 GPa and 850-1150{degrees}C, Sr{sub 2}CuO{sub 3}, SrCuO{sub 2}(II), Sr{sub 2}Cu{sub 3}O{sub 5}, and SrCu{sub 2}O{sub 3} form. In the CaO-CuO system, CaCuO{sub 2} (I) of the infinite-layer type forms at 3-5 GPa and 1050-1200{degrees}C. This compound undergoes a polymorphic structural transformation into another high-pressure form CaCuO{sub 2} (II) which comprises a new type of CuO{sub 2} planes. A structural model built on the basis of electron diffraction and high-resolution electron microscopy is presented. The ternary phase diagram at 4 GPa and 1020{degrees}C is presented.

• OSTI ID: 570218
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 132; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM OXIDES
COPPER OXIDES
ELECTRON DIFFRACTION
ELECTRON MICROSCOPY
HIGH-TC SUPERCONDUCTORS
PHASE DIAGRAMS
PHASE TRANSFORMATIONS
STRONTIUM OXIDES
X-RAY DIFFRACTION