Ruddlesden-Popper phases A sub n+1 M sub n O sub 3n+1 : Structures and properties

Conference · Fri Mar 01 00:00:00 EST 1991

OSTI ID:5735732

Kim, J S; Lee, J Y; Swinnea, J S; Steinfink, H ^[1]; Reiff, W M ^[2]; Lightfoot, P; Pei, S; Jorgensen, J D ^[3]

---

1. Texas Univ., Austin, TX (USA). Dept. of Chemical Engineering
2. Northeastern Univ., Boston, MA (USA). Dept. of Chemistry
3. Argonne National Lab., IL (USA)

Intergrowth crystal structures in inorganic systems have provide a fertile field of solid state chemical research for many years and the discovery of high-{Tc} superconducting cuprates has focused attention on intergrowth structures based on perovskite blocks. Ruddlesden and Popper (R-P hereafter) have described intergrowth structures with the general formula Sr{sub n+1}Ti{sub n}O{sub 3n+1} where n is the number of perovskite layers separated by SrO layers. Indeed, La{sub 2}CuO{sub 4} corresponds to the n = 1 phase in which the decreased ionic charge of the octahedral ion is compensated by the increased ionic charge of the dodecahedral ion. Numerous structures have been derived from the these parent compounds by the replacement of Ti{sup 4+} with lower valent transition metals and charge compensation with higher valent ions on the alkaline earth site. In this manner the series of compounds Ln{sub 2}AM{sub 2}O{sub 7}, Ln{sup 3+} = La, Nd, Sm, Eu, Gd, Tb, A{sup 2+} = Sr, Ba, M{sup 3+} = Mn, Fe, has been synthesized and they are isomorphous with the n = 2 R-P phase. Relatively few compounds with n = 3 have been investigated. We have synthesized and investigated the properties of LaSr{sub 3}Fe{sub 3}O{sub 9+{delta}} and report here some of the results. 3 figs., 1 tab.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE; National Science Foundation (NSF); USDOE, Washington, DC (USA); National Science Foundation, Washington, DC (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5735732
• Report Number(s): ANL/CP-72825; CONF-900813-2; ON: DE91011748; CNN: DMR-88-09854
• Resource Relation: Conference: International conference on the chemistry of electronic ceramic materials, Grand Teton National Park, WY (USA), 16-21 Aug 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
CRYSTAL STRUCTURE
CUPRATES
IRON OXIDES
LANTHANUM OXIDES
STRONTIUM OXIDES
YTTRIUM OXIDES
HIGH-TC SUPERCONDUCTORS
PHASE STUDIES
SPECTROSCOPY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
IRON COMPOUNDS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
656100 - Condensed Matter Physics- Superconductivity