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Title: Synthesis, structure, and physical properties of La[sub 3-x]M[sub x]Ni[sub 2]O[sub 7-[delta]] (M = Ca[sup 2+], Sr[sup 2+], Ba[sup 2+]; 0 < x [le] 0. 075)

Abstract

The synthesis, structure, and physical properties of La[sub 3-x]M[sub x]Ni[sub 2]O[sub 7-[delta]], with M = Ca[sup 2+], Sr[sup 2+], or Ba[sup 2+], and 0 < x [le] 0.075, were investigated. These compounds were prepared by a precursor method with tetramethyl ammonium hydroxide and were characterized by room temperature and high-temperature powder X-ray diffraction, TGA, electrical resistivity, and magnetic susceptibility measurements. The substituted compounds form with orthorhombic symmetry in space group Fmmm, similar to the as-prepared parent compound, La[sub 3]Ni[sub 2]O[sub 6.92]. As the amount of divalent alkaline earth metal substitution increases, the c cell parameter does not significantly change for Ca and increases significantly for Sr and Ba substitution, while the a and b cell parameters remain nearly unchanged for all cases. The observed trend in the c parameter is due to the increasing Ni[sup 3+] ion concentration for the case of Ca[sup 2+] substitution, while for Sr[sup 2+] and Ba[sup 2+] substitutions the effective larger size of the divalent cations is dominant. Significant oxygen deficiencies are noted in all of the as-prepared samples. However, upon high-pressure oxygen annealing, stoichiometric oxygen contents can be achieved. The room temperature resistivity of the as-prepared substituted compounds decreases relative to La[sub 3]Ni[sub 2]O[submore » 6.92], and at x = 0.075 a semiconductor to metal transition is observed for all M. The magnetic susceptibility is nearly temperature independent in the temperature range 100-300 K, and paramagnetic behavior is observed below 100 K.« less

Authors:
;  [1]
  1. State Univ. of New Jersey, Piscataway, NJ (United States)
Publication Date:
OSTI Identifier:
6769856
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry; (United States)
Additional Journal Information:
Journal Volume: 111:1; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM OXIDES; CRYSTAL STRUCTURE; PHYSICAL PROPERTIES; CALCIUM OXIDES; LANTHANUM OXIDES; NICKEL OXIDES; STRONTIUM OXIDES; CHEMICAL PREPARATION; ELECTRIC CONDUCTIVITY; MAGNETIC SUSCEPTIBILITY; ORTHORHOMBIC LATTICES; STOICHIOMETRY; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL ANALYSIS; COHERENT SCATTERING; CRYSTAL LATTICES; DIFFRACTION; ELECTRICAL PROPERTIES; GRAVIMETRIC ANALYSIS; LANTHANUM COMPOUNDS; MAGNETIC PROPERTIES; NICKEL COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; QUANTITATIVE CHEMICAL ANALYSIS; RARE EARTH COMPOUNDS; SCATTERING; STRONTIUM COMPOUNDS; SYNTHESIS; THERMAL ANALYSIS; TRANSITION ELEMENT COMPOUNDS; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 360204 - Ceramics, Cermets, & Refractories- Physical Properties; 360201 - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Zhang, Z, and Greenblatt, M. Synthesis, structure, and physical properties of La[sub 3-x]M[sub x]Ni[sub 2]O[sub 7-[delta]] (M = Ca[sup 2+], Sr[sup 2+], Ba[sup 2+]; 0 < x [le] 0. 075). United States: N. p., 1994. Web. doi:10.1006/jssc.1994.1209.
Zhang, Z, & Greenblatt, M. Synthesis, structure, and physical properties of La[sub 3-x]M[sub x]Ni[sub 2]O[sub 7-[delta]] (M = Ca[sup 2+], Sr[sup 2+], Ba[sup 2+]; 0 < x [le] 0. 075). United States. https://doi.org/10.1006/jssc.1994.1209
Zhang, Z, and Greenblatt, M. Fri . "Synthesis, structure, and physical properties of La[sub 3-x]M[sub x]Ni[sub 2]O[sub 7-[delta]] (M = Ca[sup 2+], Sr[sup 2+], Ba[sup 2+]; 0 < x [le] 0. 075)". United States. https://doi.org/10.1006/jssc.1994.1209.
@article{osti_6769856,
title = {Synthesis, structure, and physical properties of La[sub 3-x]M[sub x]Ni[sub 2]O[sub 7-[delta]] (M = Ca[sup 2+], Sr[sup 2+], Ba[sup 2+]; 0 < x [le] 0. 075)},
author = {Zhang, Z and Greenblatt, M},
abstractNote = {The synthesis, structure, and physical properties of La[sub 3-x]M[sub x]Ni[sub 2]O[sub 7-[delta]], with M = Ca[sup 2+], Sr[sup 2+], or Ba[sup 2+], and 0 < x [le] 0.075, were investigated. These compounds were prepared by a precursor method with tetramethyl ammonium hydroxide and were characterized by room temperature and high-temperature powder X-ray diffraction, TGA, electrical resistivity, and magnetic susceptibility measurements. The substituted compounds form with orthorhombic symmetry in space group Fmmm, similar to the as-prepared parent compound, La[sub 3]Ni[sub 2]O[sub 6.92]. As the amount of divalent alkaline earth metal substitution increases, the c cell parameter does not significantly change for Ca and increases significantly for Sr and Ba substitution, while the a and b cell parameters remain nearly unchanged for all cases. The observed trend in the c parameter is due to the increasing Ni[sup 3+] ion concentration for the case of Ca[sup 2+] substitution, while for Sr[sup 2+] and Ba[sup 2+] substitutions the effective larger size of the divalent cations is dominant. Significant oxygen deficiencies are noted in all of the as-prepared samples. However, upon high-pressure oxygen annealing, stoichiometric oxygen contents can be achieved. The room temperature resistivity of the as-prepared substituted compounds decreases relative to La[sub 3]Ni[sub 2]O[sub 6.92], and at x = 0.075 a semiconductor to metal transition is observed for all M. The magnetic susceptibility is nearly temperature independent in the temperature range 100-300 K, and paramagnetic behavior is observed below 100 K.},
doi = {10.1006/jssc.1994.1209},
url = {https://www.osti.gov/biblio/6769856}, journal = {Journal of Solid State Chemistry; (United States)},
issn = {0022-4596},
number = ,
volume = 111:1,
place = {United States},
year = {1994},
month = {7}
}