Relaxor-PT single crystals: observations and developments
| Autor: | Jun Luo, Thomas R. Shrout, Shujun Zhang, Ho-Yong Lee |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Acoustics and Ultrasonics Condensed matter physics business.industry Transition temperature Ferroelectric ceramics Electrical engineering Crystal system Atmospheric temperature range Ferroelectricity Article Tetragonal crystal system Curie temperature Electrical and Electronic Engineering business Instrumentation Perovskite (structure) |
| Zdroj: | IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 57:2138-2146 |
| ISSN: | 1525-8955 0885-3010 |
| DOI: | 10.1109/tuffc.2010.1670 |
| Popis: | Relaxor-PT based ferroelectric single crystals Pb(Zn1/3Nb2/3)O3–PbTiO3 (PZNT) and Pb(Mg1/3Nb2/3)O3–PbTiO3 (PMNT) attracted lot of attentions in last decade due to their ultra high electromechanical coupling factors and piezoelectric coefficients. However, owing to a strongly curved morphotropic phase boundary (MPB), the usage temperature of these perovskite single crystals is limited by TRT - the rhombohedral to tetragonal phase transition temperature, which occurs at significantly lower temperatures than the Curie temperature TC. Furthermore, the low mechanical quality factors and coercive fields of these crystals, usually being on the order of ~70 and 2–3kV/cm, respectively, restrict their usage in high power applications. Thus, it is desirable to have high performance crystals with high temperature usage range and high power characteristics. In this survey, different binary and ternary crystal systems were explored, with respect to their temperature usage range, general trends of dielectric and piezoelectric properties of relaxor-PT crystal systems were discussed related to their TC/TRT. In addition, two approaches were proposed to improve mechanical Q values, including acceptor dopant strategy, analogous to “hard” polycrystalline ceramics, and anisotropic domain engineering configurations. |
| Databáze: | OpenAIRE |
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