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Phase Equilibria and Elements Partitioning in Zirconolite-Rich Region of Ca-Zr-Ti-Al-Gd-Si-O System

Published online by Cambridge University Press:  03 September 2012

O. A. Knyazev ,
S. V. Stefanovsky ,
S. V. Ioudintsev ,
B. S. Nikonov ,
B. I. Omelianenko ,
A. V. Mokhov  and
A. I. Yakushev
O. A. Knyazev
Affiliation:
SIA “RADON”, 7-th Rostovskii line 2/14, Moscow 119121, Russia
S. V. Stefanovsky
Affiliation:
SIA “RADON”, 7-th Rostovskii line 2/14, Moscow 119121, Russia
S. V. Ioudintsev
Affiliation:
Institute of Geology of Ore Deposits, Staromonetny line 35, Moscow 109017, Russia
B. S. Nikonov
Affiliation:
Institute of Geology of Ore Deposits, Staromonetny line 35, Moscow 109017, Russia
B. I. Omelianenko
Affiliation:
Institute of Geology of Ore Deposits, Staromonetny line 35, Moscow 109017, Russia
A. V. Mokhov
Affiliation:
Institute of Geology of Ore Deposits, Staromonetny line 35, Moscow 109017, Russia
A. I. Yakushev
Affiliation:
Institute of Geology of Ore Deposits, Staromonetny line 35, Moscow 109017, Russia
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Abstract

Zirconolite-rich ceramics were produced by the cold crucible melting technique in an air atmosphere, at 1550±50 °C and 1 atm. Four samples with overall composition (in wt.%): 4.9–14.3 CaO; 19.0–41.3 ZrO2; 24.1–42.6 TiO2; 1.3–11.3 Al2O3; 6.8–30.0 Gd2O3, and 1.1–8.5 SiO2 have been studied. Total phases in the ceramics consist of major zirconolite and minor rutile, perovskite, zirconia, aluminium titanate, and glass. The Gd2O3 content in zirconolite reaches up to 31.4 wt.% corresponding to the formula: (Cao4,Gd0.7)Zri.0(Tii4,Alo 5)070. The data on the phase composition agree well with coupled Gd incorporation into the mineral structure. Ca(H) + Ti(IV) = Gd(III) + Al(III), and 2Gd(III) - Ca(II) + Zr(IV). The highest Gd contents observed in the other phases are 25.4 % for zirconia, 12.6 % in glass, 8.8 % in perovskite, and 1.4 % for rutile. The rest of the elements' distribution in the samples are analyzed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 401
Copyright
Copyright © Materials Research Society 1997

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