Òí ß –@ /† < Ɠ § Ó ü t o † < Æõ ,  Òí ß – 609-735 (2008¸ 2 Z 4 4{ 9 ~ à Î6 £ §)

MgO Ä Z Ø­  o ù p § T “ Ó Þ” X ¢ w ŠÆ X Ø X-ray > H± n Ç ÷ m Ç] M ö8 ý S z » Æ X Øy ¢ | ºX N Ë Ž ì ŏ Œ



™ » õ i u® £ · - ! H6 0* å  · ‚ Ð+ Ö < ÷ 7 B · ­ £* å ¬ £ ·  ™ » õ i ;M  ^∗

Â

Òí ß –@ /† < Ɠ § Ó ü t o † < Æõ ,  Òí ß – 609-735 (2008¸   2 Z 4 4{ 9  ~ à Î6 £ §)

Ä

ºo   H MgO ì  r ´ ú ˜`  ¦ s 6   x # Œ “ ¦“ : r XRD z  ´+ « >_  r « Ñ “ : r • ¸ ˜ Ð& ñ ƒ  ½ ¨\  ¦ % i  . “ : r • ¸\  ¦    or & 

 9 X-ray  r] X  z  ´+ « >`  ¦ à º' Ÿ  † < ÊÜ ¼– Ð" f   & ñ ½ ¨› ¸ “ : r • ¸\    É r    o\  ¦ ƒ  ½ ¨½ + É M :, & ñ S X ‰ ô  Ç r « ѓ : r • ¸

\ 

¦ · ú ˜l  0 AK " f, y Œ • “ : r • ¸\    É r & ñ S X ‰ ô  Ç      © œÃ º · ú ˜ 9”   MgO ì  r ´ ú ˜_   « Ñ\  ¦ s 6   x # Œ, MgO ì  r

´ ú

˜_  “ : r • ¸\    É r     © œÃ º\  ¦ 2  † < Êà º– Ð í ß –Ø  ¦ % i  . r « Ñ\  €  • 5 % _  MgO ì  r ´ ú ˜`  ¦ ' ‘  # Œ, 15

^◦

∼ 135

^◦

_  „   2θ % ò % i \ " f  r] X  z  ´+ « >`  ¦ à º' Ÿ  % i “ ¦, Õ ª   õ \  ¦ Rietveld refinement ì  r$ 3 `  ¦ # Œ, r 

«

Ñ ? /\  [ O # Œ e ”   H MgO ì  r ´ ú ˜_  & ñ S X ‰ ô  Ç      © œÃ º\  ¦ % 3 % 3  . s ü < ° ú  “ É r ~ ½ ÓZ O `  ¦ s 6   x # Œ, MgO_  “ : r

•

¸\  ¦ €  $  & ñ “ ¦, s \    É r r « Ñ_  “ : r • ¸\  ¦   É r z  ´+ « >[ þ t õ  q “ § # Œ & ñ S X ‰ ô  Ç z  ´+ « >s  ÷ &  H  כ `  ¦ S X ‰ “  

% i  .

PACS numbers: 41.60.Bq, 61.12.Ld, 77.84 Keywords: “ : r • ¸ ˜ Ð& ñ , “ ¦“ : r XRD, MgO ì  r ´ ú ˜

I. " e  ] Ø

þ

j   H í ß – oÓ ü t“ É r D h– Ðî  r y © œÄ »„  ^ ‰,  $ í ^ ‰, Õ ªo “ ¦  y © œ

^

‰ 1 p x s  µ 1 Ï| ÷ &# Qf ” \     ´ ú §“ É r Å Ò3 l q`  ¦ ~ à Γ ¦ e ”  . t  è

ß – 20¸  ç ß – y © œÄ »„  ^ ‰  H l ” > r _  BaTiO

3

, Ba

1−x

Sr

x

TiO

3

\  ¦

@

/’  K  Z  }“ É r · ú š„  $ í x 9  Ä ºÃ ºô  Ç y © œÄ »„   : £ ¤$ í `  ¦ t    PbZr

x

Ti

1−x

O

3

(PZT) _  Ó ü t| 9 \  @ / # Œ ´ ú §“ É r ƒ  ½ ¨ [1–

3]\  ¦ à º' Ÿ  ÷ &% 3 Ü ¼ 9, þ j   H \   H ˜ Ð  ¨ 8 Š ⠕ 2 ; o& h “   ™ èF 

\

 ¦ > hµ 1 Ï l  0 AK  Pb\  ¦ Ÿ í† < Ê t  · ú §  H y © œÄ »„  ^ ‰ > hµ 1 Ï\  Å

Ò§ 4 `  ¦ “ ¦ e ”   [4,5]. ¢ ¸ô  Ç La

x

Ca

1−x

MnO

3

ü < ° ú  “ É r œ í



@ /  l $ † ½ Ó ´ òõ 
 
  H í ß – oÓ ü t s  µ 1 Ï| ÷ &# Q f ”  Ü

¼– Ð" f $  © œ B ^ ‰ µ 1 τ  \   H l # Œ\  ¦ % i   [6]. s ü <  8 Ô

 ¦ # Q TbMnO

³

ü < ° ú  “ É r y © œÄ »„  $ í ÷  r ë ß –  m    $ í : £ ¤f ç s

 † < Êa  ˜ Ðs   H  y © œ^ ‰ í ß – oÓ ü t [7] s  µ 1 Ï| ÷ &# Q D h– Ðî  r ƒ  

½

¨ ì  r  – Ð" f Å Ò3 l q ~ à Γ ¦ e ”  .

s

 Qô  Ç D h– Ðî  r í ß – oÓ ü t \  @ /ô  Ç : £ ¤f ç `  ¦ s K  l  0 AK  Ã

º' Ÿ    H  € ª œô  Ç z  ´+ « > x 9  ì  r$ 3 “ É r, r « Ñ_  {  ½ ¨› ¸, „  l 

&

h

 : £ ¤$ í ,  l & h  : £ ¤$ í 1 p x`  ¦ · ú ˜ à º e ”  . ¢ ¸ô  Ç s  Qô  Ç Ó ü t

| 9

_  : £ ¤$ í “ É r y Œ • Ó ü t| 9 _  ½ ¨› ¸ü < x 9 ] X ô  Ç › ' a >  [8–10]\  ¦  t

“ ¦ e ” l  M :ë  H \ ,  r] X  z  ´+ « >`  ¦ : Ÿ x ô  Ç y Œ • Ó ü t| 9 _  ½ ¨› ¸\  ¦ ì

 r$ 3 “ É r € 9 כ ¹  . : £ ¤ y  Peroveskite ½ ¨› ¸\  ¦ t   H y © œÄ »

„

 ^ ‰_   â Ä º, B-site s “ : r _    0 A y © œÄ »„  ^ ‰ : £ ¤f ç \   H

% ò

† ¾ ÓÜ ¼– Ð Å Òl  M :ë  H \  x-ray  r] X  z  ´+ « >“ É r B Ä º ×  æ כ ¹   [8,10].

∗

E-mail: [email protected]

¢

¸ô  Ç y © œÄ »„  ^ ‰  H “ : r • ¸    o\      © œ„  s  ‰ & ³ © œ`  ¦  t

“ ¦ e ” 6 £ § Ü ¼– Ð “ : r • ¸\    É r ½ ¨› ¸ ì  r$ 3 “ É r Ó ü t| 9  : £ ¤$ í _ 

"

é

¶ “  `  ¦ µ 1 ßy   H X < ×  æ כ ¹ô  Ç % i ½ + É`  ¦ ô  Ç  [2, 3]. { 9 ì ø Í& h Ü ¼

–

Ð “ ¦“ : r  r] X  z  ´+ « >  © œu   H ³ ðï  r r « Ñ\  ¦ s 6   x # Œ  © œ u

_  “ : r • ¸\  ¦ # QÖ ¼ & ñ • ¸ ˜ Ð& ñ t ë ß –, í ß – oÓ ü t _   â Ä º \ P 

„

 • ¸• ¸ B Ä º
å ÔÙ ¼– Ð,  © œu _  “ : r • ¸ü < r « Ñ_  “ : r • ¸

 { 9 u ô  Ç “ ¦ ^  ¦ à º \ O  .   " f, ‘ : r ƒ  ½ ¨\ " f  H s 



Qô  Ç  © œu _  “ : r • ¸ü < r « Ñ_  “ : r • ¸\  ¦ ˜ Ð& ñ l  0 AK ,  

 É

r Ó ü t| 9 õ  ¸ ú ˜ ì ø Í6 £ x t  · ú §  H MgO ì  r ´ ú ˜`  ¦ r « Ñ\  5

% ' ‘  # Œ “ : r • ¸\    É r  r] X  z  ´+ « >`  ¦ à º' Ÿ  % i   [11].

‘

: r ƒ  ½ ¨\ " f  6   x ô  Ç r « э  H, þ j   H Suchomel 1 p x s  ˜ Г ¦ ô

 Ç, 0.2(BiZn

_0.5

Ti

_0.5

O

₃

)-0.8(PbTiO

₃

) (0.2BZT-0.8PT) – Ð

"

f PbTiO

³

r « Ñ\  BiZn

^0.5

Ti

0.5

O

3

\  ¦ ' ‘  # Œ & ñ ~ ½ Ó$ í (tetragonality)`  ¦ ß ¼>  7 £ x r ~  ´Ã º e ”    H  כ `  ¦ ˜ Г ¦ 

% i

  H X < [11], s  r « Ñ\  “ : r • ¸ ˜ Ð& ñ ~ ½ ÓZ O `  ¦ & h 6   x # Œ X-ray



r] X z  ´+ « >õ , s  r « Ñü < › ' a >   ) a   É r ƒ  ½ ¨  õ \  ¦ ƒ  › ' a t 

#

Q Ó ü t$ í `  ¦ ì  r$ 3  # Œ  H  כ s  0 p x † < Ê`  ¦ ˜ Ðs “ ¦  ô  Ç .

II. ÷ m Ç] M öU ê s0 n É

“

: r • ¸\    É r ½ ¨› ¸    o_  ì  r$ 3 \  & h 6   x l  0 AK  0.2(BiZn

0.5

Ti

0.5

)O

3

-0.8(PbTiO

3

) r « Ñ\  ¦ “ ¦ © œì ø Í6 £ x ~ ½ ÓZ O  Ü

¼– Ð ] j Œ • % i Ü ¼ 9. ï  r q   ) a r « Ñ\  ¦ s 6   x # Œ Ä »„  Ö  ¦ 8 £ ¤

&

ñ z  ´+ « >õ , “ ¦“ : r XRD z  ´+ « >`  ¦ à º' Ÿ  % i  . “ : r • ¸\    É r

-209-

Fig. 1. The dielectric constant as a function of the tem- perature at 100 kHz. The ferroelectric phase transition temperature is 585

^◦

C. The inset shows the x-ray diffrac- tion patterns of (101)/(110) peaks around the phase transition temperatures measured pohang synchrotron source.

Ä

»„  Ö  ¦ 8 £ ¤& ñ “ É r r « Ñ\  ¦ „  l – Ð\  V , “ É r Ê ê “ : r • ¸\  ¦ 7 £ x  r 

&

 €  " f HP4194\  ¦ s 6   x # Œ Ä »„   © œÃ º ° ú כ`  ¦ 8 £ ¤& ñ % i 



. “ ¦“ : r XRD z  ´+ « >“ É r Ÿ í† ½ Ó ~ ½ Ó  F  g 5 Å q l  8C2 c ”  “  

\

" f x-ray  r] X  z  ´+ « >`  ¦ % i Ü ¼ 9, \ P ’ < Hz  ´ x 9  / B N l  í ß –ê ø Í

\

 _ ô  Ç # Œ Q כ ¹“  [ þ t`  ¦ ] j  l  0 A # Œ ”  / B N  © œI  (∼

50 mTorr) \ " f z  ´+ « >`  ¦ à º' Ÿ  % i  . “ ¦“ : r XRD z  ´+ « >\ 

"

f r « Ñ_  & ñ S X ‰ ô  Ç “ : r • ¸\  ¦ · ú ˜l  0 A # Œ, BZT-PT ì  r ´ ú ˜ r 

«

Ñ\  5 % _  MgO ì  r ´ ú ˜`  ¦ ' ‘  r &  x-ray  r] X  z  ´+ « >`  ¦

% i Ü ¼ 9, 15

^◦

∼ 135

^◦

(2θ)  t  y Œ •y Œ •_  “ : r • ¸\  @ / # Œ 8

£ ¤& ñ % È  . y Œ • “ : r • ¸\ " f % 3 # Q”   XRD   õ \  ¦ Rietveld refinement † < ÊÜ ¼– Ð" f BZT-PT x 9  MgO _       © œÃ º\  ¦

½

¨ % i  . Rietveld refinement ~ ½ ÓZ O Ü ¼– Ð % 3 # Q”   MgO   



  © œÃ º\  ¦ “ : r • ¸\    É r      © œÃ º › ' a > d ” \  @ /{ 9  # Œ r 

«

Ñ_  & ñ x 9 ô  Ç “ : r • ¸\  ¦ % 3 % 3  .

III. ÷ m Ç] M ö+ s ÇÊ Ý / ‚ Í ‚ º8 ý

Fig. 1 “ É r 0.2BZT-0.8PT \  @ /ô  Ç “ : r • ¸\    É r XRD x 9  Ä

»„  Ò  ¦ z  ´+ « >_    õ \  ¦ ˜ Ð# Œ Šғ ¦ e ”  . Ä »„  Ö  ¦“ É r 100 kHz _

 “ §À Ó „  · ú š`  ¦ “   # Œ “ : r • ¸\  ¦ 7 £ x r v €  " f 8 £ ¤& ñ 

%

i Ü ¼ 9, “ : r • ¸\    É r Ä »„  Ò  ¦ z  ´+ « >   õ   H 585

^◦

C \ " f y © œ Ä

»„    © œ„  s  { 9 # Q
“ ¦ e ” 6 £ §`  ¦ " î S X ‰ y  ˜ Ð# Œï  r  . Fig.

1 _  ¶ ú š o  H 31

^◦

∼ 33

^◦

_  # 3 0 A\ " f % 3 “ É r XRD z  ´+ « >   õ 

\

 ¦ ˜ Ð# ŒÅ ғ ¦ e ” Ü ¼ 9, y Œ • “ : r • ¸  H  © œu _  “ : r • ¸\  ¦
 ? /“ ¦ e ”

 . ¶ ú š o\   Ø Ô€   “ : r • ¸ 7 £ x † < Ê\     (110)/(011)

`

 ¦ \ P  >   ) a  . t ë ß – “ ¦“ : r XRD _   â Ä º z  ´+ « > © œq _ 

6   x ô  Ç / B N ç ß –s  a ž ?™ è l  M :ë  H \ , ç  H{ 9 ô  Ç “ : r • ¸ ì  r 0 Al \  ¦ ]

j/ B N K  ×  ¦ à º e ”   H „  l – Ð\  ¦  6   x t  3 l w ô  Ç . s  z  ´+ « >\ 

"

f  6   x ) a z  ´+ « > © œq   H  © œu ü < r « Ñ_  é ß –\ P `  ¦ 0 AK   © œ“ : r

\

" f €  • 10

⁻³

torr _  ”  / B N ì  r 0 Al \ " f z  ´+ « >  9, ì  r ´ ú ˜ r 

«

Ñ  – Ð  A _  sample holder \  K-type thermocouple\  ¦



© œ‚ Ã Ì # Œ “ : r • ¸\  ¦ 8 £ ¤& ñ % i  . s  M :, \ P “ É r r « Ñ_  ô  Ç A á ¤

€

 ë ß – \ P ÷ &“ ¦,
 Qt  €  “ É r ”  / B N Ü ¼– Ð — ¸¿ º é ß –\ P  ) a  © œI  s

 . s ü < ° ú  “ É r › ¸| _  z  ´+ « >¨ 8 Š ⠓ É r \ P „  • ¸Ö  ¦ s  a % ~ t  3 l w ô

 Ç í ß – oÓ ü t õ  ° ú  “ É r r « э  H, ”  / B N Ü ¼– Ð é ß –\ P  ÷ &# Q e ”   H €   _

 ì  r ´ ú ˜, 7 £ ¤ z  ´] j  r] X \  l # Œ   H ì  r ´ ú ˜ r « Ñ_  “ : r • ¸  H thermocouple s  ì  r ´ ú ˜ r « Ñ_   – Ð  A \  Z  ~ # Œ e ”  8 

•

¸ thermocouples  { 9 “ É r “ : r • ¸ü <  H  H s \  ¦ t >   ) a



. s – Ð “  K  Ä »„    © œÃ º 8 £ ¤& ñ \ " f_  r « Ñ_  “ : r • ¸  H ’  ø @

$ í

`  ¦ S X ‰ ˜ Ð ½ + É Ã º e ” Ü ¼
, “ ¦“ : r XRDz  ´+ « >_  r « Ñ “ : r • ¸  H

#

QÖ ¼ & ñ • ¸_  ˜ Ð& ñ s  € 9 כ ¹ >   ) a  .   " f, “ ¦“ : r XRD z 

´+ « >\ " f_  “ : r • ¸ ˜ Ð& ñ `  ¦ 0 A # Œ Ä ºo   H ³ ðï  r r « і Ð" f MgO ì  r ´ ú ˜`  ¦ ‚  × þ ˜ % i  . MgO ì  r ´ ú ˜“ É r   É r Ó ü t| 9 \  q  K

 0 l q  H& h s  Z  } Ü ¼ 9, Z  }“ É r î ß –& ñ $ í `  ¦ t “ ¦ e ” # Q   É r Ó ü t

| 9

õ  ì ø Í6 £ x`  ¦ ¸ ú ˜ t  · ú §  H  © œ& h s  e ”  . ¢ ¸ô  Ç MgO\  @ / ô

 Ç \ P Ø Ÿ ‚ ½ Ó > à º [12,13] 1 p x s  ¸ ú ˜ · ú ˜ 94 R e ” # Q “ : r • ¸\   

 É

r      © œÃ º › ' a > \  ¦ ~ 1 >  ½ ¨½ + É e ”  .

Fig. 2  H MgO ì  r ´ ú ˜_      © œÃ ºü < “ : r • ¸_  › ' a > \  ¦ ˜ Ð

#

ŒÅ ғ ¦ e ”  . Ä ºo   H MgO _       © œÃ ºü < “ : r • ¸_  › ' a > \  ¦ 2 † < Êà º

Y = a + bx + cx

²

(1)

–

Ð
  ? /% 3 “ ¦, 30

^◦

C \ " f  Ò'  1000

^◦

C  t _       © œ Ã

º\    É r “ : r • ¸ † < Êà º\  ¦ % 3 `  ¦ à º e ” % 3  . s X O >  % 3 # Q”   MgOì  r ´ ú ˜_      © œÃ ºü < “ : r • ¸ü <_  › ' a > \  ¦ s 6   x # Œ “ ¦

“

: r XRD z  ´+ « >\ " f % 3 # Q”   0.2BZT-0.8PTì  r ´ ú ˜_    õ \  ¦ Rietveld refinement [14] ~ ½ ÓZ O Ü ¼– Ð ì  r$ 3  † < ÊÜ ¼– Ð+ ‹ & ñ S X ‰ ô  Ç r

« Ñ_  “ : r • ¸\  ¦ % 3   H X < & h 6   x >   ) a  .

Fig. 2. The lattice constant of the MgO powder as a function of the temperature (closed circles). The solid line is the fitting of the lattice constant using a second order polynomial function of the temperature.

Fig. 3. The Rietveld refinement analysis for PAL X-ray diffraction data at two different temperatures: (a) The tetragonal structure at room temperature and (b) The cubic structure at high temperature (higher than T

_C

).

Ä

ºo   H “ ¦“ : r z  ´+ « >_  > l š ¸ \  ¦ ×  ¦ s l  0 A # Œ, 0.2BZT-0.8PT r « Ñü < MgO ì  r ´ ú ˜`  ¦ y Œ •y Œ • z  ´+ « >`  ¦ t 

Fig. 4. The calibrated temperature of the sample by using the MgO powder (closed circle) and un-calibrated temperature of the sensor reading (the solid line). Note that the temperature difference between sample and in- strument increased as the temperature increased.

· ú

§“ ¦, r « Ñ ? /\  5 %_  MgO ì  r ´ ú ˜`  ¦ ' ‘  † < ÊÜ ¼– Ð+ ‹ 1 l x{ 9  ô

 Ç ¨ 8 Š â \ " f z  ´+ « >`  ¦ à º' Ÿ  % i  .  r] X z  ´+ « >   õ \  ¦ ì  r$ 3 

  H X <\  & h 6   x ô  Ç Rietveld refinement ~ ½ ÓZ O “ É r z  ´+ « >   õ  ü

< > í ß – ÷ &# Q ”     & ñ ½ ¨› ¸ü <  © œu  כ ¹“  \  l œ íô  Ç — ¸4 S q   s

_  s \  ¦ þ j™ è o • ¸2 Ÿ ¤   à º\  ¦ ‚  × þ ˜ # Œ Ó ü t o & h  _  p

\  ´ ú • ¸2 Ÿ ¤    or &  ì  r ´ ú ˜ r « Ñ_    & ñ ½ ¨› ¸\  ¦  [ jy 

¬

¹    H ~ ½ ÓZ O s  . X-ray r] X  Á º] (\ " f   & ñ _       © œ Ã

º  H ì  r ´ ú ˜ r « Ñ\ " f   & ñ _  ß ¼l ü <   & ñ  s \ " f  Œ •6   x

  H “   © œ§ 4  1 p x \  _ K  % ò † ¾ Ó`  ¦ ~ à ΍  H  . Ä ºo   H Rietveld refinement ~ ½ ÓZ O  ì  r$ 3 \  e ” # Q" f, Thomsom Pseudo-Voit profile † < Êà º\  ¦  6   x # Œ  r] X  Á º] (_  + þ AI ü <   & ñ _  ß ¼ l

\  _ ô  Ç ´ òõ \  ¦ ì  r$ 3  % i “ ¦, 0.2BZT-0.8PTì  r ´ ú ˜ r « Ñ _

 p [ j½ ¨› ¸ ì  r$ 3 `  ¦ 0 AK  P. W. Stephens † < Êà º\  ¦ s 6   x 

#

Œ anisotropic-strain כ ¹“  `  ¦ ˜ Ð& ñ % i   [15]. s X O >   r ] X

Á º] (\  % ò † ¾ Ó`  ¦ Šҍ  H   “  `  ¦ — ¸¿ º ˜ Ð& ñ # Œ MgO ì  r ´ ú ˜ _

 & ñ S X ‰ ô  Ç     © œÃ º\  ¦ y Œ •y Œ •_  “ : r • ¸\ " f % 3 `  ¦ à º e ” % 3  .

Fig. 3 “ É r  © œ“ : r _  tetragonal  © œõ  “ ¦“ : r _  Cubic  © œ\ 

"

f à º' Ÿ ô  Ç Rietveld refinement ô  Ç   õ \  ¦ ˜ Ð# Œ Šғ ¦ e ” 



. y Œ •y Œ • 0 AA á ¤ \  Õ ª 9”  0.2BZT-0.8PT_   © œõ   A A á ¤ \  Õ

ª 9”   MgO  © œ_  Bragg-peak 0 Au \  ¦ ^  ¦ à º e ” Ü ¼ 9, >  í

ß – ° ú כõ  8 £ ¤& ñ ° ú כ, Õ ªo “ ¦ Õ ª s \  ¦ ¿ º Õ ªa Ë >\ " f ^  ¦ à º e ” 



.

Fig. 4   H MgO ì  r ´ ú ˜_      © œÃ º\  ¦ s 6   x # Œ ˜ Ð& ñ ô  Ç r

« Ñ_  “ : r • ¸ü <  © œu – РÒ'  { 9 “ É r “ : r • ¸\  ¦ q “ § l  0 AK 

 ? /% 3  . z  ´‚  “ É r  © œu _  “ : r • ¸ü < r « Ñ_  “ : r • ¸ ° ú  `  ¦ M

:
 ± ú ˜ à º e ”   H   õ s  . Ä ºo  % 3 “ É r r « Ñ_  “ : r • ¸



 H Ï ã T“ É r " é ¶ Ü ¼– Ð ³ ðr   ) a & h s  9, s  & h “ É r “ ¦“ : r Ü ¼– Ð ° ú ˜Ã º

Fig. 5. The ferroelectric transition temperatures from four different experiments: Dielectric constant mea- surement (open diamond), dielectric constant measure- ment from reference (filled diamond), synchrotron x-ray (SXRD) measurement without temperature calibration (open circle), SXRD measurement with temperature cal- ibration (closed circle), respectively.

2

Ÿ

¤ & h & h   © œu _  “ : r • ¸ü <  H  H s \  ¦ ˜ Ðs “ ¦ e ”  . s     õ

\  ¦, q 5 p w ô  Ç › ¸$ í _  y © œÄ »„   ^ ‰s  9 · ú š„   ´ òõ  B Ä º ß ¼

“

¦ High-T

^c

Ó ü t| 9 – Ð · ú ˜ 9”   Pb(Zr

0.52

Ti

0.48

)O

3

\  & h 6   x K 

‘

: r  €  , s  Ó ü t| 9 _  y © œÄ »„    © œ„  s  “ : r • ¸“   €  • 400

^◦

C   H % ƒ

\

" f• ¸ 90

^◦

C s  © œ_   H “ : r • ¸ s \  ¦ ˜ Ð{ 9  à º e ”  .   

"

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Sample-temperature Calibration for High-temperature XRD Using MgO Powder

Bongju Kim, Daeyoung Kwon, Junyoung Jo, Youngsu Wu and Bog G. Kim

^∗

Department of Physics, Pusan National University, Busan 609-735

(Received 4 February 2008)

A temperature-calibration method for X-ray powder scattering using a MgO powder has been demonstrated experimentally. The temperature-dependent lattice parameter of the MgO standard material is well known. By adding 5 % MgO as a calibration material, we performed X-ray scattering measurement on a 0.2(BiZn

0.5

Ti

0.5

O

3

)-0.8(PbTiO

3

) sample to check the structural phase transition.

A full-pattern rietveld refinement was applied to obtain the lattice constant of the MgO powder.

The exact temperature of the specimen could be obtained from a polynomial fitting of the lattice constant of the MgO powder at each temperature. The current method can be generally applied to various X-ray experiments at high temperatures.

PACS numbers: 41.60.Bq, 61.12.Ld, 77.84

Keywords: Rietveld refinement, Temperature calibration of XRD, MgO reference powder

∗

E-mail: [email protected]