PROPERTIES OF ANTIFERROELECTRIC CRYSTALS 

H. P. R. Frederikse

Some  important  antiferroelectric  crystals  are  listed  here  with 

their Curie Temperatures T

C

. The last column gives the constant 

T

0

 which appears in the Curie-Weiss law describing the dielectric 

constant of these materials above the Curie Temperature:

 

ε=const./(T–T

0

)

Name or acronym

Formula

T

C

/K

T

0

/K

ADP

NH

4

H

2

PO

4

148

ADA

NH

4

H

2

AsO

4

216

ADDP

NH

4

D

2

PO

4

242, 245

ADDA

NH

4

D

2

AsO

4

299

A

d

DDP

ND

4

D

2

PO

4

243

A

d

DDA

ND

4

D

2

AsO

4

304

Sodium niobate

NaNbO

3

911, 793

Lead hafnate

PbHfO

3

476

378

Lead zirconate

PbZrO

3

503

475

Lead metaniobate

PbNb

2

O

6

843

530

Lead metatantalate

PbTa

2

O

6

543

533

Tungsten trioxide

WO

3

1010

Potassium strontium niobate

KSr

2

Nb

5

O

15

427

413

Sodium nitrite

NaNO

2

437

437

Sodium trihydrogen selenite

NaH

3

(SeO

3

)

2

193

192

Sodium trideuterium selenite

NaD

3

(SeO

3

)

2

271

245

Ammonium trihydrogen periodate (NH

4

)

2

H

3

IO

6

245

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