Dielectric and optical properties of a quasi-ferroelectric PLZT ceramic

Journal Article · Sun Dec 31 23:00:00 EST 1972 · Proceedings of the IEEE

DOI:https://doi.org/10.1109/PROC.1973.9186· OSTI ID:4370566

Carl, K.; Geisen, K.

Certain compositions within the quaternary lead-lanthanumtitanate- zirconate (PLZT) system exhibit neither a true'' ferroelectric nor a true'' paraelectric behavior and are therefore best characterized as quasi-ferroelectric. The dielectric, hysteresis, and optical properties of quasi-ferroelectric PLZT ceramics have been investigated for the representative 9/85/35 composition which was prepared as a transparent ceramic by means of a two-stage sintering- densification process. The results of these studies suggest that the quasi- ferroelectric behavior of PLZT compositions between their Curie temperature and a transition temperature T/sub p is brought about by the existence of polar distorted microregions (polar short-range order). By applying an electric field a transition to a macroscopic ferroelectric (FE) state (polar long-range order) is enforced which is, however, not stable at zero field at T> T_p. This concept, which explains the experimental observations, is compared with the possibility of a FE to anti-FE phase transition at T/sub p/. Attention is drawn to the quasi-static memory behavior of this type of material that can be realized by disconnecting the samaple in its ON state from the voltage source and which might enlarge the scope of applications of quasi-ferroelectric PLZT ceramics.

• Research Organization: Philips Forschungslaboratorium, Aachen
• Sponsoring Organization: USDOE
• NSA Number: NSA-29-013104
• OSTI ID: 4370566
• Journal Information: Proceedings of the IEEE, Journal Name: Proceedings of the IEEE Journal Issue: 7 Vol. 61; ISSN 0018-9219
• Publisher: Institute of Electrical and Electronics Engineers
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*LANTHANUM OXIDES-- OPTICAL PROPERTIES
*LEAD OXIDES-- OPTICAL PROPERTIES
*TITANATES-- OPTICAL PROPERTIES
*ZIRCONATES-- OPTICAL PROPERTIES
CURIE POINT
DENSITY
FERROELECTRIC MATERIALS
N50130* --Metals
Ceramics
& Other Materials--Ceramics & Cermets--Properties
Structure & Phase Studies
SINTERING
TRANSITION TEMPERATURE