ZnO‐activated formation of phase pure perovskite Pb(In 1/2 Nb 1/2 )O 3 ‐Pb(Zn 1/3 Nb 2/3 )O 3 ‐PbTiO 3 powder
Abstract This paper reports on the phase formation of perovskite Pb(In 1/2 Nb 1/2 )O 3 ‐Pb(Zn 1/3 Nb 2/3 )O 3 ‐PbTiO 3 ( PIN ‐ PZN ‐ PT ) powder when doped with 0.04 to 0.83 mol% ZnO. Air calcination of undoped powder mixtures for 4 hours at 800°C resulted in a mixture of Pb 2 Zn 0.29 Nb 1.71 O 6.56...
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Published in | Journal of the American Ceramic Society Vol. 102; no. 7; pp. 3932 - 3939 |
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Main Authors | , , , , , |
Format | Journal Article |
Language | English |
Published |
01.07.2019
|
Online Access | Get full text |
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Summary: | Abstract
This paper reports on the phase formation of perovskite Pb(In
1/2
Nb
1/2
)O
3
‐Pb(Zn
1/3
Nb
2/3
)O
3
‐PbTiO
3
(
PIN
‐
PZN
‐
PT
) powder when doped with 0.04 to 0.83 mol% ZnO. Air calcination of undoped powder mixtures for 4 hours at 800°C resulted in a mixture of Pb
2
Zn
0.29
Nb
1.71
O
6.565
pyrochlore,
PIN
‐
PZN
‐
PT
perovskite, and In
2
O
3
. ZnO dopant concentrations as low as 0.04 mol% increased the rate of perovskite formation and resulted in near phase pure perovskite powder of 0.5 μm particle size when heated at 800°C in air. In all cases PbTiO
3
and Pb(In
1/2
Nb
1/2
)O
3
formed prior to
PIN
‐
PZN
‐
PT
formation. ZnO doping promotes perovskite phase formation by increasing the reactivity of the intermediate pyrochlore phase by substituting Zn
2+
on Nb
5+
sites and forming oxygen vacancies when heated in air. Heating in high
resulted in an incomplete reaction and a mixture of perovskite and pyrochlore whereas low
resulted in phase separation into a mixture of rhombohedral perovskite, tetragonal perovskite, and pyrochlore. The
sensitivity clearly shows that oxygen vacancies due to ZnO‐doping are critical for synthesis of phase pure
PIN
‐
PZN
‐
PT
powder. |
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ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/jace.16296 |