Thermochemical characteristics of Lan+1NinO3n+1 oxides / Bannikov D. O.,Safronov A. P.,Cherepanov V. A. // THERMOCHIMICA ACTA. - 2006. - V. 451, l. 1-2. - P. 22-26.

ISSN/EISSN:

0040-6031 / нет данных

Type:

Article

Abstract:

Lanthanum nickelates: La2NiO4+delta, La3N2O7-delta, La4Ni3O10-delta and LaNiO3-delta the members of Ruddlesden-Popper series Lan+1NinO3n+1 were prepared using citrate route. Dissolution enthalpies of complex oxides as well as a number of subsidiary substances were measured by means of Calvet calorimeter in 1 M solution of hydrochloric acid at 25 degrees C. The dissolution scheme of complex oxides in hydrochloric acid was proposed and enthalpies of formation of the complex oxides from binary oxides were calculated considering oxygen nonstoichiometry of these substances. Enthalpies of step-by-step oxidation were evaluated. Partial enthalpy contribution of LaO layers was calculated endothermic equals to 30.9 J/mol while partial enthalpy contribution of perovskite LaNiO3 layers was negative equals to -97.0 J/mol. Enthalpy of fort-nation of any complex oxide of Ruddlesden-Popper series fits very well to the linear regression based on these values. (C) 2006 Elsevier B.V. All rights reserved.

Author keywords:

lanthanum nickelates; oxygen nonstoichiometry; solution calorimetry; enthalpies of dissolution; enthalpies of formation NI-O SYSTEM; THERMODYNAMIC ANALYSIS; LA2NIO4+DELTA; DIFFRACTION

DOI:

10.1016/j.tca.2006.08.004

Web of Science ID:

ISI:000243142900005

Соавторы в МНС:

Другие поля

Поле	Значение
Month	DEC 1
Publisher	ELSEVIER SCIENCE BV
Address	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language	English
Keywords-Plus	NI-O SYSTEM; THERMODYNAMIC ANALYSIS; LA2NIO4+DELTA; DIFFRACTION
Research-Areas	Thermodynamics; Chemistry
Web-of-Science-Categories	Thermodynamics; Chemistry, Analytical; Chemistry, Physical
Author-Email	Dmitry.Bannikov@usu.ru
ResearcherID-Numbers	Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459
Number-of-Cited-References	17
Usage-Count-Since-2013	16
Journal-ISO	Thermochim. Acta
Doc-Delivery-Number	121FG