Hi:
I don't think PLZT likes being stored at 700K. What is its Curie
Temperature? If it is near 700K you are depoling the sample. Also, the
translucence of PLZT is due to oxygen vacancies. You may be, depending on
the atmosphere you are working in, either increasing(oxidizing atmosphere)
or decreasing (reducing or passive atmosphere) the number of these
vacancies. If you heat PLZT to the temperature you are operating at in a
weak vacuum, say 10-3+  torr, it will look like a charcoal briquette within
ten minutes. I hope this helps.
Regards, Joel Dubow,
University of Utah

-----Original Message-----
From: mems-talk-admin@memsnet.org [mailto:mems-talk-admin@memsnet.org]On
Behalf Of Gurvinderjit Singh
Sent: Wednesday, August 29, 2001 12:37 AM
To: mems-talk@memsnet.org
Subject: [mems-talk] Hot pressed PLZT

 Hello!
          I am having hot pressed translucent PLZT with me, whose colour
is changing with time and temperature(700K). Some body who is working on
these ferroelectrics, can tell me the possible reasons for that.
thanks




____________________________________________________________________________
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   Gurvinderjit Singh Ahluwalia             Tel: +91-0731-488656
     Laser Materials Division               Fax: +91-0731-488650
   Centre for Advanced Technology         email: gjit@cat.ernet.in
   Indore - 452 013  INDIA

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