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Hydrothermal Synthesis and Characterization of ThO2, UxTh1-xO2, and UOx

Published online by Cambridge University Press:  14 August 2013

Jacob Castilow ,
Timothy W Zens ,
J. Matthew Mann ,
Joseph W. Kolis ,
Colin D. McMillen  and
James Petrosky
Jacob Castilow
Affiliation:
Air Force Institute of Technology, Wright Patterson AFB, OH, United States. Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States.
Timothy W Zens
Affiliation:
Air Force Institute of Technology, Wright Patterson AFB, OH, United States.
J. Matthew Mann
Affiliation:
Air Force Research Laboratory, Sensors Directorate, Wright Patterson AFB, OH, United States.
Joseph W. Kolis
Affiliation:
Center for Optical Materials Science and Engineering Technologies and Department of Chemistry, Clemson University, Clemson, SC United States.
Colin D. McMillen
Affiliation:
Center for Optical Materials Science and Engineering Technologies and Department of Chemistry, Clemson University, Clemson, SC United States.
James Petrosky
Affiliation:
Air Force Institute of Technology, Wright Patterson AFB, OH, United States.
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Abstract

Hydrothermal synthesis of ThO2, UxTh1-xO2, and UOx at temperatures between 670°C and 700°C has been demonstrated. Synthesis at these temperatures is 50-80°C below prior growth studies and represents a new lower bound of successful growth. ThO2 single crystals of dimensions 6.49mm x 4.89mm x 3.89 mm and weighing 0.633g have been synthesized at average growth rates near 0.125mm/week. Single crystal UxTh1-xO2 crystals with mole fractions up to x≈0.30 have also been grown. The largest alloyed crystal with mole fraction x≈0.23 has dimensions of 2.97mm x 3.23mm x ∼3mm and recorded average growth rates near 0.2mm/week. Four structures were solved from X-ray diffraction data and their crystallographic data reported here. Rocking curve analysis determined a dislocation density of 1.2×109 cm-2.

Keywords

hydrothermalactinidex-ray diffraction (XRD)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1576: Symposium WW – Nuclear Radiation Detection Materials , 2013 , mrss13-1576-ww03-06
Copyright
Copyright © Materials Research Society 2013 

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