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Title: Redox response model for partly substituted cuprates

Abstract

Inhomogeneous substitutions (e.g. clustering and preferential site occupations) in compounds such as YBa[sub 2](Cu[sub 1[minus]x]M[sub x])[sub 3]O[sub y] with M = Fe, Co, Ni, etc. are an unavoidable response to the changing redox environments in these O intercalation compounds. The authors collect here experimental evidence for various types of inhomogeneous distributions predicted on a thermodynamic model which considers the preferential desorption'' of O from various local environments. The parameter organizing the redox environment is [Delta]H* (incremental enthalpy of oxygen desorption per mol O[sub 2]). Theory suggests a sequence of discernible states represented by the acronym CLUSTER. With decreasing [Delta]H*, indications for several of these states are obtained from Moessbauer and other experiments. These states are characteristically shifted in [Delta]H* for different M. Also, further substitutions according to (YX)(BaZ)[sub 2](CuM)[sub 3]O[sub y] with X = Ca, Z = Sr, La can change the relevant [Delta]H* for these states, allowing prediction of their preparation conditions. Aspects of the complex electronic phase diagram as a function of redox preparation are discussed.

Authors:
 [1]
  1. Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Chemistry
Publication Date:
OSTI Identifier:
7289005
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin; (United States)
Additional Journal Information:
Journal Volume: 29:5; Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM OXIDES; ELECTRONIC STRUCTURE; COPPER OXIDES; YTTRIUM OXIDES; CALCIUM OXIDES; COBALT OXIDES; IRON OXIDES; LANTHANUM OXIDES; NICKEL OXIDES; OXYGEN; REDOX POTENTIAL; STRONTIUM OXIDES; THERMODYNAMIC PROPERTIES; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COBALT COMPOUNDS; COPPER COMPOUNDS; ELEMENTS; IRON COMPOUNDS; LANTHANUM COMPOUNDS; NICKEL COMPOUNDS; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; STRONTIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS; 360204* - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Oesterreicher, H. Redox response model for partly substituted cuprates. United States: N. p., 1994. Web. doi:10.1016/0025-5408(94)90036-1.
Oesterreicher, H. Redox response model for partly substituted cuprates. United States. https://doi.org/10.1016/0025-5408(94)90036-1
Oesterreicher, H. 1994. "Redox response model for partly substituted cuprates". United States. https://doi.org/10.1016/0025-5408(94)90036-1.
@article{osti_7289005,
title = {Redox response model for partly substituted cuprates},
author = {Oesterreicher, H},
abstractNote = {Inhomogeneous substitutions (e.g. clustering and preferential site occupations) in compounds such as YBa[sub 2](Cu[sub 1[minus]x]M[sub x])[sub 3]O[sub y] with M = Fe, Co, Ni, etc. are an unavoidable response to the changing redox environments in these O intercalation compounds. The authors collect here experimental evidence for various types of inhomogeneous distributions predicted on a thermodynamic model which considers the preferential desorption'' of O from various local environments. The parameter organizing the redox environment is [Delta]H* (incremental enthalpy of oxygen desorption per mol O[sub 2]). Theory suggests a sequence of discernible states represented by the acronym CLUSTER. With decreasing [Delta]H*, indications for several of these states are obtained from Moessbauer and other experiments. These states are characteristically shifted in [Delta]H* for different M. Also, further substitutions according to (YX)(BaZ)[sub 2](CuM)[sub 3]O[sub y] with X = Ca, Z = Sr, La can change the relevant [Delta]H* for these states, allowing prediction of their preparation conditions. Aspects of the complex electronic phase diagram as a function of redox preparation are discussed.},
doi = {10.1016/0025-5408(94)90036-1},
url = {https://www.osti.gov/biblio/7289005}, journal = {Materials Research Bulletin; (United States)},
issn = {0025-5408},
number = ,
volume = 29:5,
place = {United States},
year = {1994},
month = {5}
}