8/11/2019 Poster Eulasur Fercho

http://slidepdf.com/reader/full/poster-eulasur-fercho 1/1

Optical and electro-optical properties as a function of

temperature in transparent ferroelectric ceramic 

Acknowledgments

optical and electro-optical properties of Pb,La(TiO3), (PLT) and Pb,La(Mg1/3 Nb2/3)O3 – PbTiO3, (PLMN-PT) has bee

ween room temperature and 400 K at 632.8 nm using a dynamic Senarmont system to 200 Hz. The electro-optic (EO)

MN-PT is related through a simple model to the quadratic electro-optic effect in paraelectric perovskites proposed by Zoo

The measured magnitude and the temperature dependence of the electro-optic effect were consistent with this mrpretation of the EO effect in term of our model model indicates the importance of BO 6 octahedra in determination the EO

well as the ferroelectric and optical and electro-optical properties

The transmittance of PLMN-PT ceramics obtained by

axially hot pressing was strongly dependent on PT

ncentration, possibly due to domain scattering and to second

ases scattering which were not detected by XRD technique.

The use of the densification assisted by hot uniaxial pressure

owed ceramics with optimum optical and electro-optics

operties in relation to the reported in literature

The coefficient quadratic electro-optical birefringence and for

concentrations of PLMN-PT systems and PMN-XPT XPT-

decreased by function of increasing temperature in the

nge studied, between 293K-403 K. in this temperature range

all compositions were already in the state ferroelectric above

freezing temperature. 

Londoño F. A. (1) , E ir as J. A. (1), Gar cia D . (1)  1 Un iversidade Federal de São Car los  –  Depto de F ísica  –  Grupo de Cerâmicas Ferr oelétr icas (GCF err )  –  São Car los –  SP –  Brasil  

email: flondono@df.ufscar.br

To Mr. Francisco José Picon and Mrs. Natália Aparecida Zanardi for the technical supp

onclusions

Motivation

Experimental Procedure

200 300 400 500 600 700 800 900

0

10

20

30

40

50

60

   %    T

  r  a  n  s  m   i   t   t  a  n  c  e

 

Wavelegth(nm)

 PLMN

 PLMN

 PLMN

 PLMN

 PLMN

Thickness = 630 nm

Ceramic character ization: optical and electr

http://www.bostonati.com/Products_Nanona.html

MgNb 2 O 6 Syntheses (Columbi te method)

Ball mill ing of PbO - TiO 2   – 

 MgNb 2 O 6  - La 2 O 3 , for 20 h  

Calcini ng, for 4 h, 900 o C, in O 2  

Griding for 20 h

Cold un iaxi al and isostatic pressing (2, mm

in thickness and 14 mm in di ameter)  

Uniaxial hot-pressing, at 1250 o C, for 90 min, in O 2

Characterization

Senarmont system

11 12 13 1410

20

30

40

50

60

 

   %    T

  r  a  n  s  m   i   t   t  a  n  c  e

PT content, (X)

Thickness = 630 m

650 nm

 850 nm

 1100 nm

PLMN-XPT

   S  e  c  o  n   d  p   h  a  s  e  s  s  c  a   t   t  e  r   i  n  g

Thickness 600 μm 

280 300 320 340 360

0

5

10

15

20

20

Temperatura (K)

   C  o  e   f   i  c   i  e  n   t  e   K  e  r  r   (   1

   0  -   1   6

   m   2   /   V   2   )

PL

 PL

 PL

 PL

 PL

200 300 400 500 600 700 800 900 1000 1100

0

10

20

30

40

50

60

 as-fired

 after thermal treatment

  in O2 (5h+5h+10h)

 

   %    T

  r  a  n  s  m   i   t   t  a  n  c  e

Wavelenght (nm)

PLT21t = 600m

17 18 19 20 21 22 23 24

0

10

20

30

40

50

60

PT content, (X)

   %    T

   r   a   n   s   m   i   t   t   a   n   c   e

Thermal treated hot pressed ceramics

  d  o  m  a  i  n  s  s  c  a  t  t  e  r  i  n  g

  s  e  c  o  n  d  p  h  a  s  e  s  s  c  a  t  t  e  r  i  n  g

  900nm

650 nm

500nm

 

Control of a light beam Intense laser beam

Laser damage effect