FORMATION OF PYROCHLORE PHASES IN THE PBO-NB2O5(-FE2O3) SYSTEM

Authors
BALZER B LANGBEIN H
Citation
B. Balzer et H. Langbein, FORMATION OF PYROCHLORE PHASES IN THE PBO-NB2O5(-FE2O3) SYSTEM, Journal of alloys and compounds, 244(1-2), 1996, pp. 1-6
Citations number
22
Categorie Soggetti
Chemistry Physical","Metallurgy & Metallurigical Engineering","Material Science
Journal title
Journal of alloys and compounds → ACNP
ISSN journal
09258388
Volume
244
Issue
1-2
Year of publication
1996
Pages
1 - 6
Database
ISI
SICI code
0925-8388(1996)244:1-2<1:FOPPIT>2.0.ZU;2-C
Abstract
Phases in the PbO-Nb2O5 system were synthesized by reaction of amorpho us Nb2O5 with PbC2O4. The pyrochlore Pb2.31Nb2O7.3 is kinetically favo ured up to at least 700 degrees C, whereas cubic Pb3Nb4O13 not formed as a pure phase. When Fe3+ is incorporated into the pyrochlore structu re, the Pb3Nb4O13 formation is accelerated. The oxygen vacancies creat ed by the Fe3+ insertion enable the structure to receive more PbO up t o the composition Pb-4(Fe1/6Nb5/6)(4)O-13.33, which corresponds to the ideal pyrochlore A(2)B(2)O(7).