Neutron Diffraction, Synchrotron Radiation and EXAFS Spectroscopy Study of Crystal Structure Peculiarities of the Lanthanum Nickelates Lan+1NinOy (n=1,2,3) | Sciact - CRIS-system of Boreskov Institute of Catalysis

Neutron Diffraction, Synchrotron Radiation and EXAFS Spectroscopy Study of Crystal Structure Peculiarities of the Lanthanum Nickelates Lan+1NinOy (n=1,2,3) Full article

Journal

Nuclear Instruments and Methods in Physics Research Section A
ISSN: 0168-9002

Output data

Year: 2001, Volume: A 470, Number: 1-2, Pages: 202-209 Pages count : 8 DOI: 10.1016/s0168-9002(01)01036-1

Tags

Lanthanum nickelates; Crystal structure; EXAFS; Neutron diffraction

Authors

Voronin V.I. ¹ , Berger I.F. ² , Cherepanov V.A. ³ , Gavrilova L.Ya. ³ , Petrov A.N. ³ , Ancharov A.I. ⁴ , Tolochko B.P. ⁴ , Nikitenko S.G. ⁵

Affiliations

1	Institute for Metal Physics, Ural Branch of Russian Academy of Sciences, Yekaterinburg, Russia
2	Institute of Solid State Chemistry, Ural Branch of Russian Academy of Sciences, Yekaterinburg, Russia
3	Department of Chemistry, Ural State University, Lenin av., 51, 620083 Yekaterinburg, Russia
4	Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia
5	Institute of Catalysis, Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russia

Funding (2)

1	Civilian Research and Development Foundation	REC-005
2	Russian Foundation for Basic Research	00-03-32070

Complex oxides: La2NiO4 (I), La3Ni2O7 (II) and La4Ni3O10 (III), belonging to the homologous series Lan+1MenO3n+1, were prepared by the traditional ceramic technique (I) and by that of citrate or nitrate precursors (II), (III). The crystal structure of all samples was determined by means of X-ray diffraction, neutron diffraction and synchrotron radiation spectroscopy. Data on nickel coordination were obtained by EXAFS spectroscopy. Phases (II) and (III) were used for structural investigations as prepared powders (quenched from 1100°C in air), phase (I) was pressed into rectangular bars (5×5×30 mm) and sintered at 1370°C for 5 h. Structural parameters of all phases were refined based on Cmca (I), Cmcm (II) and Cmca (III) space group using the Rietveld analysis. Bond lengths in all compounds were calculated. Oxygen octahedrons centered by nickel ions were distorted in (I) and (II). (I) has two and (II) has four different Ni–O interatomic distances. Phase (III) has both ideal and distorted octahedrons in the structure and two types of nonequivalent Ni sites, as a result. The oxidation state of cations was estimated using the average cation–anion distance approach and the so-called bond valence approach. The results allowed us to suggest that Ni3+ preferably occupied the Ni1 sites, i.e. it is possible to assume some charge ordering inside the lattice.

Voronin V.I. , Berger I.F. , Cherepanov V.A. , Gavrilova L.Y. , Petrov A.N. , Ancharov A.I. , Tolochko B.P. , Nikitenko S.G.
Neutron Diffraction, Synchrotron Radiation and EXAFS Spectroscopy Study of Crystal Structure Peculiarities of the Lanthanum Nickelates Lan+1NinOy (n=1,2,3)
Nuclear Instruments and Methods in Physics Research Section A. 2001. V.A 470. N1-2. P.202-209. DOI: 10.1016/s0168-9002(01)01036-1 WOS Scopus OpenAlex

Accepted:

Aug 28, 2021

Web of science:	WOS:000170979000042
Scopus:	2-s2.0-0035450669
OpenAlex:	W1965949453

DB	Citing
OpenAlex	55
Web of science	46
Scopus	48