Journals →  Tsvetnye Metally →  2011 →  #10 →  Back

Magnesium, titanium, rare metals, semiconductors
ArticleName Physical-chemical investigation of gadolinium hydroxide powders
ArticleAuthor Myakisheva L. V., Chernova O. P., Panov V. S., Lopatin V. Y.
ArticleAuthorData

National University of Science and Technology "MISIS"

L. V. Myakisheva, Senior Research Officer, phone: (495) 638-46–90

O. P. Chernova, Assistant Professor
V. S. Panov, Professor
V. Yu. Lopatin, Assistant Professor

Abstract

This investigation is devoted to estimation of physical-chemical characteristics of fine-grained gadolinium hydroxide powders which can be used as alloying additives of new generation introduced in small amount into UO2-based nuclear fuel. Gadolinium hydroxide was precipitated from maximum diluted hydrochloric solutions at permanent stirring and pH ~ 6. The powder grain-size dependence on precipitator concentration is studied. It was established that most fine-grain powders (with equiaxial and spherical particles of 0,5 to 5 μm) are obtained using 5 to 10% solution of ammonium hydrate, whereas increasing of NH3·H2O concentration up to 25% leads basically to precipitation of large particles and agglomerates of amorphous (according to X-rays diffraction method) Gd(OH)3 up to 80 μm. Using X-rays and gravimetric analysis the conditions are determined for amorphous Gd(OH)3 formation and its stabilization by transformation to monohydrate of gadolinium metahydroxide which forms crystalline gadolinium oxide during two-stage dehydration accompanied by formation of Gd(OOH) line structure and final compound Gd2O3. Chromatic effect for gadolinium hydroxide powders — color changing from white to pink-violet as a result of variation in precipitation condition and thermal treatment (drying) — is confirmed.

keywords Gadolinium hydroxide, precipitator, concent ration, grain-size composition, phase composition, gravimetric analysis, gadolinium metahydroxide, dehydration, chromatic effect
References

1. Baranov V. G., Tenishev A. V., Pokrovskiy S. A., Shornikov D. P., Kuzmin R. S. Teplofizicheskie svoystva modifitsirovannogo oksidnogo yadernogo topliva : Nauchnaya sessiya NIYaU MIFI (Thermophysical properties of the modified oxide nuclear fuel : Scientific session of National Nuclear Research University "MEPhI"). 2010. Vol. 2.
2. Omelnik A. P., Levenets V. V., Shchur A. A. Visnik Kharkivskogo universitetu — Bulletin of Kharkov University. 2005. No. 710. p. 104.
3. Andreev A. I., Bocharov A. V., Ivanov A. B., Libenson G. A. Izvestiya vuzov. Tsvetnaya metallurgiya — Proceedings of Higher School. Non-ferrous Metallurgy. 2002. No. 4. pp. 47–50.
4. Panov V. S., Lopatin V. Yu. Sostavy, tekhnologiya i svoystva poroshkovykh materialov dlya yadernoy tekhniki (Compounds, Technology and Properties of Powder Materials for Nuclear Engineering). Moscow, 2008.
5. Serebrennikova V. V., Alekseeva L. A. Kurs khimii redkozemelnykh elementov (Course of Chemistry of Rare-Earth Elements). Tomsk, 1969.
6. Myakisheva L. V., Chernova O. P., Panov V. S. Sintez i fiziko-khimicheskie issledovaniya tonkodispersnykh poroshkov gidroksida gadoliniya. Sb. trudov Mezhdunarodnoy nauchnoprakticheskoy internet-konferentsii «Nauchnye issledovaniya i ikh prakticheskoe primenenie. Sovremennoe sostoyanie i puti razvitiya 2010» (Synthesis and physical and chemical studies of gadolinium hydroxide fine powders. Proceedings of the International Scientific and Practical Internet Conference "Scientific Research and Their Practical Applications. Current Status and Development Trends of 2010"). Odessa, 15.10.2010.
7. Sukharev Yu. I., Belkanova M. Yu. Modelirovanie protsessa gidratatsii oksigidratov gadoliniya i itterbiya (Modeling of gadolinium and ytterbium oxyhydrate hydration process). Izvestiya Chelyabinskogo nauchnogo tsentra — Proceedings of the Chelyabinsk Scientific Center. 2005. Vol. 29, issue 3.
8. Sukharev Yu. I., Egorov Yu. V., Potemkin V. A. and etc. Okrashivanie oksigidratnykh geley nekotorykh tyazhelykh metallov (Coloration of oxyhydrate gels of some heavy metals). Izvestiya Chelyabinskogo nauchnogo tsentra — Proceedings of the Chelyabinsk Scientific Center. 1999. Issue 3.

Language of full-text russian
Full content Buy
Back