Weak-relaxor behaviour was observed in K1−xBixNb1−xYbxO3 ceramics with x = 0.20 and x = 0.30. According to x-ray diffraction analysis, the crystal structure of these ceramics can be described by the cubic centrosymmetric Pm3¯m space group; however Raman spectroscopy reveals both the occurrence of local lattice distortions and the disruption of the long-range ferroelectric order. The local lattice strain caused by the larger Yb3+ combined with the presence of Bi3+, which lone-pair of electrons induces further local distortions, gives rise to polar nanoregions (PNRs). Nevertheless, the interaction between the PNRs appears weak and proper relaxor behaviour does not develop.

1.
R. E.
Cohen
,
Nature
358
(
6382
),
136
(
1992
).
2.
G.
Shirane
,
R.
Newnham
, and
R.
Pepinsky
,
Phys. Rev.
96
(
3
),
581
(
1954
).
3.
P.
Baettig
,
C.
Ederer
, and
N. A.
Spaldin
,
Phys. Rev. B
72
(
21
),
214105
(
2005
).
4.
R. E.
Eitel
,
C. A.
Randall
,
T. R.
Shrout
,
P. W.
Rehrig
,
W.
Hackenberger
, and
S. E.
Park
,
Jpn. J. Appl. Phys., Part 1
,
40
(
10
),
5999
(
2001
).
5.
I. M.
Reaney
,
J. Electroceram.
19
(
1
),
1
(
2007
).
6.
H.
Ogihara
,
C. A.
Randall
, and
S.
Trolier-McKinstry
,
J. Am. Ceram. Soc.
92
(
1
),
110
(
2009
).
7.
S. S. N.
Bharadwaja
,
J. R.
Kim
,
H.
Ogihara
,
L. E.
Cross
,
S.
Trolier-McKinstry
, and
C. A.
Randall
,
Phys. Rev. B
83
(
2
),
024106
(
2011
).
8.
J.
Kreisel
and
P.
Bouvier
,
J. Raman Spectrosc.
34
(
7-8
),
524
(
2003
).
9.
A.
Kumar
,
J. F.
Scott
, and
R. S.
Katiyar
,
Appl. Phys. Lett.
99
,
042907
(
2011
).
10.
A.
Feteira
,
J.
Kreisel
, and
D. C.
Sinclair
,
J. Am. Ceram. Soc.
93
(
12
),
4174
(
2010
).
11.
T.
Strathdee
,
L.
Luisman
,
A.
Feteira
, and
K.
Reichmann
,
J. Am. Ceram. Soc.
94
(
8
),
2292
(
2011
).
12.
A.
Feteira
and
D. C.
Sinclair
,
J. Mater. Chem.
19
(
3
),
356
(
2009
).
13.
J.
Pokorny
,
U. M.
Pasha
,
L.
Ben
,
O. P.
Thakur
,
D. C.
Sinclair
, and
I. M.
Reaney
,
J. Appl. Phys.
109
,
114110
(
2011
).
14.
K. A.
Rabe
,
M.
Dawber
,
C.
Lichtensteiger
,
C. H.
Ahn
, and
J. M.
Triscone
,
Top. Appl. Phys.
105
,
1
(
2007
).
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