High-pressure high-temperature synthesis of Mn4Nb2O9. A XRD and TEM study / Tyutyunnik AP,Zubkov VG,D'yachkova TV,Zainulin YG,Tarakina NV,Sayagues MJ,Svensson G // SOLID STATE SCIENCES. - 2002. - V. 4, l. 7. - P. 941-949.

ISSN/EISSN:

1293-2558 / нет данных

Type:

Article

Abstract:

A new high-pressure, high-temperature modification of Mn4Nb2O9, has been prepared at T = 1700degreesC, P = 9 GPa. The XRD study based on Rietveld technique suggests the structure to be a rhombohedral (R3c) modification of Mn4Nb2O9, (LiNbO3 type structure) with the chemical formula Mn(Mn1/3Nb2/3)O-3 and unit cell parameters a = 5.34139(2), c = 14.15807(7) Angstrom. However, electron diffraction (ED) and high resolution electron microscopy (HREM) images of crystallites found in an XRD single phase sample revealed frequent disorder, but also the existence of a new monoclinic modification of Mn4Nb2O9 often intergrown with the corundum related P (3) over bar c1-Mn4Nb2O9 modification stable at ambient pressure and temperature. This new monoclinic modification has the unit cell parameters: a = 9.93, b = 5.34, c = 13.20 Angstrom, b = 92.9degrees and space group C2/c or Cc. It is closely related to the corundum lattice since its c{*} axis is parallel to (202)(R (3) over barc){*} in the rhombohedral sublattice. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.

Author keywords:

manganese niobium oxides; oxoniobate; X-ray powder diffraction; Rietveld refinements; crystal structured; high pressure; electron diffraction; HREM; high resolution electron microscopy; electron micro

DOI:

10.1016/S1293-2558(02)01345-6

Web of Science ID:

ISI:000177955700009

Соавторы в МНС:

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Другие поля

Поле	Значение
Month	JUL
Publisher	EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
Address	23 RUE LINOIS, 75724 PARIS CEDEX 15, FRANCE
Language	English
Article-Number	PII S1293-2558(02)01345-6
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Inorganic \& Nuclear; Chemistry, Physical; Physics, Condensed Matter
ResearcherID-Numbers	Tarakina, Nadezda/A-7870-2013 Tyutyunnik, Alexander/P-2230-2015 SAYAGUES, MARIA JESUS/J-7039-2012
ORCID-Numbers	Tarakina, Nadezda/0000-0002-2365-861X SAYAGUES, MARIA JESUS/0000-0002-5555-310X
Number-of-Cited-References	6
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	19
Journal-ISO	Solid State Sci.
Doc-Delivery-Number	592UR