Facts & Figures
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Spontaneous Polarization for Ferroelectric Materials B.A. Turtle, Sandia National Laboratories; D.A. Payne and J.L. Mukherjee, University of Illinois
o060 tS
0.50
D
0.40
PEROVSKITES AND TUNGSTEN-BRONZES NaBazNbIo1s A
PLZT "(3 0.30
%\ A UK S , < N 1 ,, 1 of N * S '° M '' 0 '.
. K N>0,
i
• Pb(Zn 1n Nb M )O,
0.20 «0
LINaSr.Nb^Ojo
o V.VlnU, Family
(Q ••••*
I
100
200
300
400
500
600
700
800
I 800
1000
Transition Temperature (°K)
Tc
d
P
Ps(298°K)
Cp(298°K)
(°K)
(Mg/m3)
(MVm/O°K)
(C/m2)
(J/kg«°K)
Ps (Tc) (C/m2)
(J/kg«°K)
LITaO3
891
7.45
0.71
0.50
430
0.36 (723)
430 (300)
LifJbO3
1483
4.64
0.91
0.71
640
0.67 (723)
640 (300)
BaTiO3
403
6.02
0.67
0.26
418
0.19
668 740
Material
Cp (Tc)
K(Nb)O 3
691
4.59
0.47
0.30
740
0.26
K(l\lb 094 Ta 060 )0 3
656
4.29
0.54
-
-
0.18
792 (298)
K(l\lb 082 Ta 018 )0 3
591
724 (298)
763
0.61 1.00
0.05
PbTiOo
4.29 7.50
PZT(95/5)
7.41 7.41
0.32 0.02
7.41
0.40
0.23 0.20 0.20
451 (300) 451 (300) 451 (300)
5.65
0.57
5.20
0.32
5.20
0.08
KDP
493 383 450 833 351 398 123
2.34
79.20
Nal\IO2
436
2.15
TGS
322 298 451
1.69 1.78 8.05
PLZT(8/65/35) PSZT Ba 2 l\lal\lb 5 0 15 SBI\l(60/40) SBM(50/50)
Rochelle Salt
0.81 0.50 0.34 0.34 0.34 0.40 0.34
360 360 451 451 451 403 397
17.00
0.05 (100) 0.08
1090
30.60 50.40 11.30
0.03 0.01 0.05
971 741 836
305
0.11 0.03
397 (300) 368(100) 3680 1511(403) 0.05 39300 0.02(318) 1883
Various families of ferroelectric materials can be seen in the graph of spontaneous polarization versus Curie temperature. For many applications, a figure of merit can be based on the polarization; processing or use considerations must take into account the transition temperature. Tc is the transition temperature, (3 is the Curie constant, d is the density, Ps is the spontaneous polarization, and Cp is the heat capacity. From Ferroelectrics 27 (1980) p. 220, with permission. Graphics by Mike Youngman, Sandia National Laboratories. The MRS Bulletin's Facts and Figures department presents graphs, nomographs, tables, charts, and frequently used information of the type compiled by materials researchers and often taped to the walls by their desks. These "cheat sheets" are intended to be not only interesting but useful enough to keep for reference. Please send your comments and any potential material for future publication to: Alan Hurd ([email protected]), Sandia National Laboratories, Albuquerque, NM 87185-0609.
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