A-Site Cation Disorder in SrxBa1-xNb2O6 (x = 0.25, 0.33, 0.50, 0.61) Studied by High-Resolution Resonant X-ray Powder Diffraction
The dielectric and ferroelectric properties of Sr x Ba 1– x Nb 2 O 6 (SBN, 0.2 < x < 0.8) are known to be affected by the Sr fraction and can be further controlled by various quenching schemes. Changes in A-site cation configuration are believed to be linked to these changes in properties. In...
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Published in | ACS omega Vol. 8; no. 40; pp. 37592 - 37599 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
10.10.2023
|
Online Access | Get full text |
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Summary: | The dielectric and
ferroelectric properties of Sr
x
Ba
1–
x
Nb
2
O
6
(SBN,
0.2 <
x
< 0.8) are known to
be affected by the Sr fraction and can be further controlled by various
quenching schemes. Changes in A-site cation configuration are believed
to be linked to these changes in properties. In this work, we study
the A-site cation disorder in SBN by the use of high-resolution resonant
X-ray powder diffraction. The experimental results show that the larger
Ba
2+
is found exclusively on the larger A2 site, while
Sr
2+
is found on both the A1 and A2 sites, with an increasing
amount on A2 with an increasing Sr fraction. At elevated temperatures,
a small migration of Sr
2+
from A1 to A2 is observed for
SBN50 and SBN61. Linking this change in occupancies to changes in
the average cation size on the A1 and A2 sites allows for rationalization
of the property changes observed for quenched samples. Furthermore,
SBN25 is shown to deviate from the tetragonal
P
4
bm
structure and is found to be orthorhombic with a
Cmm
2 structure. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2470-1343 |
DOI: | 10.1021/acsomega.3c06500 |