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XRD, SEM and TEM Study of the Gd-Doped Zirconolites

Published online by Cambridge University Press:  21 March 2011

Sergey V. Stefanovsky ,
Albert Y. Troole ,
Maria I. Lapina ,
Boris S. Nikonov ,
Anatoliy V. Sivtsov  and
Sergey V. Yudintsev
Sergey V. Stefanovsky
Affiliation:
SIA “Radon” 7th Rostovskii per. 2/14, Moscow 119121 RUSSIA, [email protected]
Albert Y. Troole
Affiliation:
SIA “Radon” 7th Rostovskii per. 2/14, Moscow 119121 RUSSIA, [email protected]
Maria I. Lapina
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, RAS, Staromonetnii 35, Moscow 109017, Russia.
Boris S. Nikonov
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, RAS, Staromonetnii 35, Moscow 109017, Russia.
Anatoliy V. Sivtsov
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, RAS, Staromonetnii 35, Moscow 109017, Russia.
Sergey V. Yudintsev
Affiliation:
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, RAS, Staromonetnii 35, Moscow 109017, Russia.
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Abstract

Ceramic samples with formulations Ca1-xGdxZrTi2-xAlxO7(0 ≤ x ≤1) were prepared by cold pressing in pellets at 200 MPa followed by their sintering at either 1400 or 1500 °C for 5 hours. All the samples produced were single phase with rare grains of cubic zirconia based solid solution in the samples with high Gd and Al contents (x = 0.9 and 1.0). The samples produced at 1500 °C were more homogeneous and less porous than the samples sintered at 1400 °C. From SEM/EDS data average compositions of zirconolite in the samples are very close to specified formulation (within experimental error), for example, the zirconolite formula in the ceramic with x = 1 was found to be Gd1.04Zr1.02Ti1.07Al0.85O7. XRD and TEM patterns showed monoclinic (2M) structure for zirconolites, which transforms to higher symmetry modification within 0 ≤ x ≤ 0.5 compositional range. Zirconolite with high Gd content x →1 forms two varieties with trigonal and orthorhombic structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ11.14
Copyright
Copyright © Materials Research Society 2002

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