skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: La2Ni2O6: A New Double T'-type Nickelate with Infinite Ni1=/2=O2 Layers

Abstract

New mixed-valent, Ni{sup 1+}/Ni{sup 2+}, metastable nickelate, La{sub 3}Ni{sub 2}O{sub 6}, was synthesized by low-temperature reduction of La{sub 3}Ni{sub 2}O{sub 7} with CaH{sub 2}. The crystal structure of La{sub 3}Ni{sub 2}O{sub 6} (space group: I4/mmm, a = 3.9686(1) Angstroms and c = 19.3154(6) Angstroms) was determined from powder neutron diffraction data by Rietveld analysis. The structure can be described as an intergrowth of LaO{sub 2} fluorite and double infinite layer (LaNiO{sub 2}){sub 2} blocks and represents the n = 2 homologue of the T'-type series La{sub n+1}Ni{sub n}O{sub 2n+2}. Such double T'-type structural arrangement has never been observed before. The 3d{sup 9}/3d{sup 8} electronic configuration of Ni{sup 1+}/Ni{sup 2+} and the presence of NiO{sub 2} infinite layers resemble electronic and structural features of the superconducting cuprates. X-ray absorption spectroscopy supports the 1+/2+ oxidation state and planar coordination of Ni in agreement with the structure determination.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
914212
Report Number(s):
BNL-78780-2007-JA
Journal ID: ISSN 0002-7863; JACSAT; TRN: US0801605
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Am. Chem. Soc.; Journal Volume: 128
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; ABSORPTION SPECTROSCOPY; CONFIGURATION; CRYSTAL STRUCTURE; CUPRATES; FLUORITE; NEUTRON DIFFRACTION; NICKELATES; NSLS; national synchrotron light source

Citation Formats

Poltavets,V., Lokshin, K., Dikmen, S., Croft, M., Egami, T., and Greenblatt, M.. La2Ni2O6: A New Double T'-type Nickelate with Infinite Ni1=/2=O2 Layers. United States: N. p., 2006. Web. doi:10.1021/ja063031o.
Poltavets,V., Lokshin, K., Dikmen, S., Croft, M., Egami, T., & Greenblatt, M.. La2Ni2O6: A New Double T'-type Nickelate with Infinite Ni1=/2=O2 Layers. United States. doi:10.1021/ja063031o.
Poltavets,V., Lokshin, K., Dikmen, S., Croft, M., Egami, T., and Greenblatt, M.. Sun . "La2Ni2O6: A New Double T'-type Nickelate with Infinite Ni1=/2=O2 Layers". United States. doi:10.1021/ja063031o.
@article{osti_914212,
title = {La2Ni2O6: A New Double T'-type Nickelate with Infinite Ni1=/2=O2 Layers},
author = {Poltavets,V. and Lokshin, K. and Dikmen, S. and Croft, M. and Egami, T. and Greenblatt, M.},
abstractNote = {New mixed-valent, Ni{sup 1+}/Ni{sup 2+}, metastable nickelate, La{sub 3}Ni{sub 2}O{sub 6}, was synthesized by low-temperature reduction of La{sub 3}Ni{sub 2}O{sub 7} with CaH{sub 2}. The crystal structure of La{sub 3}Ni{sub 2}O{sub 6} (space group: I4/mmm, a = 3.9686(1) Angstroms and c = 19.3154(6) Angstroms) was determined from powder neutron diffraction data by Rietveld analysis. The structure can be described as an intergrowth of LaO{sub 2} fluorite and double infinite layer (LaNiO{sub 2}){sub 2} blocks and represents the n = 2 homologue of the T'-type series La{sub n+1}Ni{sub n}O{sub 2n+2}. Such double T'-type structural arrangement has never been observed before. The 3d{sup 9}/3d{sup 8} electronic configuration of Ni{sup 1+}/Ni{sup 2+} and the presence of NiO{sub 2} infinite layers resemble electronic and structural features of the superconducting cuprates. X-ray absorption spectroscopy supports the 1+/2+ oxidation state and planar coordination of Ni in agreement with the structure determination.},
doi = {10.1021/ja063031o},
journal = {J. Am. Chem. Soc.},
number = ,
volume = 128,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}