Preparation and characterization of new phases in Na-(U0.5Pu0.5)-Mo-O and
Na-(Th
x
U1−x
)-Mo-O (x = 0.5 and 0.8) systems by X-ray and thermal methods
Author:
Dahale Nandakumar Dattatrya1,
Sali Sanjay Krishnarao1,
Keskar Meera Sanjay1,
Phatak Rohan Anil1,
Kesavaiyer Krishnan1,
Kannan Shanmugaperumal1
Affiliation:
1. Fuel Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085
Abstract
Abstract
Na2(Th
x
U1−x
)(MoO4)3 and Na4(Th
x
U1−x
)(MoO4)4 (x = 0.5 and
0.8) were synthesized, by reacting (Th
x
U1−x
)(MoO4)2 with Na2MoO4 in appropriate
molar ratios at 873 K in an evacuated quartz ampoule for 25 h. While
Na2(U0.5Pu0.5)(MoO4)3 and Na4(U0.5Pu0.5)(MoO4)4 were
synthesized, by reacting (U0.5Pu0.5)(MoO4)2 with Na2MoO4 in appropriate molar
ratios at 873 K in argon atmosphere for 45 h. The crystal structure of these compounds
were derived from powder XRD data in a tetragonal system (space group: I41/a) by Rietveld profile
method. Thermogravimetric curves of Na2(Th
x
U1−x
)(MoO4)3 and
Na4(Th
x
U1−x
)(MoO4)4 did not show any weight changes up to 973 K in helium
atmosphere. High temperature X-ray diffraction (HTXRD) studies of Na2(Th
x
U1−x
)(MoO4)3
and Na4(Th
x
U1−x
)(MoO4)4 in vacuum showed positive thermal expansion in the
temperature range of 298 to 873 K.
Publisher
Walter de Gruyter GmbH
Subject
Physical and Theoretical Chemistry