Chemical ordering of the B-site cations in undoped, 5, 10, 20, and 30 mol % La3+-doped Pb(Mg1/3Nb2/3)O3 (PMN) ceramics with perovskite structure, has been examined by Raman scattering. Two B-site chemical ordering models, the space-charge model, and the random layer model assume a space group of Fm3̄m for the ordered nanoregions. It is found that A1g Raman mode around 780 cm−1 from the B-site ordered nanoregions with a space group Fm3̄m, is very sensitive to the delicate changes of the chemical order at B site. Frequency changes of this A1g characteristic mode with La3+ doping, are analyzed according to the lattice parameters and chemical order effects. The present results provide stronge evidence supporting the random layer model in La-doped PMN.

1.
L. E.
Cross
,
Ferroelectrics
76
,
241
(
1987
).
Google Scholar
 
2.
Z. G.
Ye
,
Key Eng. Mater.
155–156
,
81
(
1998
).
Google Scholar
 
3.
G. A.
Smolensky
,
J. Phys. Soc. Jpn.
28
,
26
(
1970
).
Google Scholar
 
4.
D.
Viehland
,
S.
Jang
, and
L. E.
Cross
,
J. Appl. Phys.
68
,
2916
(
1990
);
Google Scholar
 
D.
Viehland
,
S.
Jang
, and
L. E.
Cross
,
J. Appl. Phys.
69
,
6595
(
1991
).
Google Scholar
 
5.
V.
Westphal
,
W.
Kleeman
, and
M. D.
Glinchuk
,
Phys. Rev. Lett.
68
,
847
(
1992
).
Google Scholar
 
6.
A. E.
Glazounov
and
A. K.
Tagantsev
,
Phys. Rev. Lett.
85
,
2192
(
2000
).
Google Scholar
 
7.
R.
Blinc
,
J.
Dolinsek
,
A.
Gregorovic
,
B.
Zalar
,
C.
Filipic
,
Z.
Kutnjak
,
A.
Levstik
, and
R.
Pirc
,
Phys. Rev. Lett.
83
,
424
(
1999
).
Google Scholar
 
8.
N.
Setter
and
L. E.
Cross
J. Mater. Sci.
15
,
2478
(
1980
).
Google Scholar
 
9.
J.
Chen
,
H. M.
Chan
, and
M. P.
Harmer
,
J. Am. Ceram. Soc.
72
,
593
(
1989
).
Google Scholar
 
10.
C. A.
Randall
and
A. S.
Bhalla
,
Jpn. J. Appl. Phys.
29
,
327
(
1990
).
Google Scholar
 
11.
A. D.
Hilton
,
D. J.
Barber
,
C. A.
Randall
, and
T. R.
Shrout
,
J. Mater. Sci.
29
,
3462
(
1990
).
Google Scholar
 
12.
T.
Egami
,
W.
Dmowski
,
S.
Teslic
,
P. K.
Davies
,
I.-W.
Chen
, and
H.
Chen
,
Ferroelectrics
206
,
231
(
1998
).
Google Scholar
 
13.
V.
Gosula
,
A.
Tkachuk
,
K.
Chung
, and
H.
Chen
,
J. Phys. Chem. Solids
61
,
221
(
2000
).
Google Scholar
 
14.
D. M.
Fanning
,
I. K.
Robinson
,
S. T.
Jung
,
E.
Colla
,
D. D.
Viehland
, and
D. A.
Payne
,
J. Appl. Phys.
87
,
840
(
2000
).
Google Scholar
 
15.
D. M.
Fanning
,
I. K.
Robinson
,
X.
Lu
, and
D. A.
Payne
,
J. Phys. Chem. Solids
61
,
209
(
2000
).
Google Scholar
 
16.
M. K.
Akbas
and
P. K.
Davies
,
J. Am. Ceram. Soc.
80
,
2933
(
1997
).
Google Scholar
 
17.
P. K.
Davies
and
M. A.
Akbas
,
J. Phys. Chem. Solids
61
,
159
(
2000
).
Google Scholar
 
18.
Y.
Yan
,
S. J.
Pennycook
,
Z.
Xu
, and
D.
Viehland
,
Appl. Phys. Lett.
24
,
3145
(
1998
).
Google Scholar
 
19.
Z.
Xu
,
S. M.
Gupta
,
D.
Viehland
,
Y.
Yan
, and
S. J.
Pennycook
,
J. Am. Ceram. Soc.
83
,
181
(
2000
).
Google Scholar
 
20.
F.
Jiang
,
S.
Kojima
,
C.
Zhao
, and
C.
Feng
,
J. Appl. Phys.
88
,
3608
(
2000
).
Google Scholar
 
21.
I. G.
Siny
,
S. G.
Lushnikov
,
R. S.
Katiyar
, and
V. H.
Schmidt
,
Ferroelectrics
226
,
191
(
1999
).
Google Scholar
 
22.
F.
Jiang
and
S.
Kojima
,
Jpn. J. Appl. Phys.
38
,
5132
(
1999
).
Google Scholar
 
23.
L. J.
Lin
and
T. B.
Wu
,
J. Am. Ceram. Soc.
73
,
1253
(
1990
).
Google Scholar
 
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