Phase transformations in rapid thermal processed lead zirconate titanate
| Autor: | L. Weaver, Michael Sayer, E. M. Griswold, I.D. Calder |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Materials science
Mechanical Engineering Nucleation Pyrochlore Analytical chemistry engineering.material Condensed Matter Physics Lead zirconate titanate Ferroelectricity chemistry.chemical_compound chemistry Mechanics of Materials Rapid thermal processing Phase (matter) engineering General Materials Science Thin film Perovskite (structure) |
| Zdroj: | Journal of Materials Research. 10:3149-3159 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/jmr.1995.3149 |
| Popis: | The crystallization kinetics of the pyrochlore to perovskite phase transformation in lead zirconate titanate (PZT) thin films have been analyzed using rapid thermal processing (RTP). Sol-gel PZT thin films, fabricated on platinum electrodes, were annealed at 550 °C to 650 °C with hold times ranging from 1 s to 5 min. Glancing angle x-ray diffraction (XRD) was used for depth profiling to identify the location of phases in the films. Transmission electron microscopy (TEM) provided information on grain structure, nucleation, and growth. The phase information was correlated to the ferroelectric and dielectric properties. The perovskite phase nucleated in the pyrochlore phase throughout the film thickness, and at 650 °C the transformation was complete in 15 s. Fast growing (100) PZT nucleated at the platinum and consumed a small-grained matrix until a columnar structure was obtained. A ramp rate of 100 °C/s was sufficiently fast to prevent transformation during heating and allowed the direct application of an Avrami model for transformation kinetics. An activation energy of 610 kJ/mol was determined. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink