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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