Formation processes of oxide phases from polymer-salt complexes of ammonium molybdate and tungstate / Valiev E., Bogdanov S., Pirogov A., Teplykh A., Ostrouschko A., Mogilnikov Y. // Physica B: Condensed Matter. - 2000. - V. 276-278, l. . - P. 854-855.

ISSN:

09214526

Type:

Article

Abstract:

The thermal decomposition processes of the polymer-salt solution of ammonium molybdate and tungstate are studied by small angle neutron scattering (SANS) and X-ray diffraction. The parameters of the crystal structure of the oxide phase particles WO3 and MoO3, a particle size distribution function, a specific surface and fractal dimension of particle to surface, a volume part and a mean particle size have been obtained. It is shown that the best catalytic properties are reached by heating the samples up to 400 °C. This state is defined by the mean particle size approximately 15 nm, the specific surface approximately 10 m2/g, the particle volume concentration approximately 5×10-2 and the fractal dimension of particles surface approximately 2.5. A general mechanism for the formation of the oxide phases from different polymer-salt solution is established. The processes of the phase formation as a first-order phase transition are also shown.

Author keywords:

Index keywords:

Catalysis; Crystal structure; Heating; Molybdenum compounds; Neutron scattering; Particle size analysis; Pyrolysis; Salts; Tungsten compounds; X ray diffraction; Small-angle neutron scattering (SANS);

DOI:

10.1016/S0921-4526(99)01626-9

Смотреть в Scopus:

https://www.scopus.com/inward/record.uri?eid=2-s2.0-0033879347&doi=10.1016%2fS0921-4526%2899%2901626-9&partnerID=40&md5=83a38e41facf0b89bd07d4ad885d4890

Соавторы в МНС:

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Другие поля

Поле	Значение
Link	https://www.scopus.com/inward/record.uri?eid=2-s2.0-0033879347&doi=10.1016%2fS0921-4526%2899%2901626-9&partnerID=40&md5=83a38e41facf0b89bd07d4ad885d4890
Affiliations	Institute of Metal Physics, Ural Br. Russ. Acad. Sci., S. K., Ekaterinburg, Russian Federation; Inst. of Phys. and Appl. Mathematics, USU, Ekaterinburg, Russian Federation
References	Park, I.H., (1972) Bull. Soc. Japan, 45, p. 2739; Kiss, A.B., Gado, P., Astalos, I., (1970) Acta Chim. Acad. Sci. Hung., 66, p. 225; Wong, P., (1985) Phys. Rev. B, 22, p. 7417; Scraybin, Yu.n., (1994) Phys. Stat. Sol. B, 182, p. 33; Debye, P., Anderson, H.R., Bruberger, H., (1957) J. Appl. Phys., 28, p. 679; Ball, H.D., Schmidt, P.W., (1984) Phys. Rev. Lett., 53, p. 596
Correspondence Address	Valiev, E.; Russian Acad of Sciences, Ekaterinburg, Russian Federation
Sponsors	Atominstitut Vienna;Budapest Neutron Centre;Forschungszentrum Julich;HMI Berlin
Publisher	Elsevier Science Publishers B.V., Amsterdam, Netherlands
Conference name	2nd European Conference on Neutron Scattering (ECNS '99)
Conference date	1 September 1999 through 4 September 1999
Conference location	Budapest, Hung
Conference code	56726
CODEN	PHYBE
Language of Original Document	English
Abbreviated Source Title	Phys B Condens Matter
Source	Scopus