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Abstract

In order to prepare actinide dioxide single crystals the thermal gradient method was adopted. In this process, relatively small solvent quantities are necessary. The yield is high (up to 80 %) and a detailed knowledge of the solvent - actinide oxide system is not necessary, the temperature remaining constant during the process. The 2PbO - V-2O-5 flux has been chosen because of its - low vapour pressure even at high temperature (1300 degrees C) - compatibility with platinum - viscosity. The apparatus used to grow actinide dioxide single crystals is shown. The platinum crucible containing the flux and the nutrient (oxide powder or pressed pellets) is heated in a resistance furnace. Cold gas (nitrogen) is injected into a platinum tube to obtain a suitable temperature gradient. The single crystals are growing on the platinum tube. Single crystals of thorium, neptunium, and plutonium dioxide have been grown as well as Np doped thorium dioxide. The experimental conditions and results are summarized. The average growth rate for all the actinide dioxides is about 1 mm/week. The single crystals have been characterized by X-ray diffraction.

Additional information

Authors: RIZZOLI C, JRC KARLSRUHE ESTAB. (GERMANY);SPIRLET J C JRC KARLSRUHE ESTAB. (GERMANY), JRC KARLSRUHE ESTAB. (GERMANY)
Bibliographic Reference: 1ST INTERNATIONAL CONFERENCE ON THE CHEMISTRY AND TECHNOLOGY OF THE LANTHANIDES AND ACTINIDES, VENEZIA (ITALY) SEPT. 5-10, 1983 - WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31205 ORA
Availability: Can be ordered online
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