TY - JOUR
T1 - Recent developments in high curie temperature perovskite single crystals
AU - Zhang, Shujun
AU - Randall, Clive A.
AU - Shrout, Thomas R.
N1 - Funding Information:
Manuscript received November 28, 2003; accepted May 10, 2004. This work supported by the National Institutes of Health (NIH) and Office of Naval Research (ONR).
PY - 2005/4
Y1 - 2005/4
N2 - The temperature behavior of various relaxor-PT piezoelectric single crystals was investigated. Owing to a strongly curved morphotropic phase boundary, the usage temperature of these perovskite single crystals is limited by T R-T - the rhombohedral to tetragonal phase transformation temperature - which occurs at significantly lower temperatures than the Curie temperature T C. Attempts to modify the temperature usage range of Pb(Zn 1/3Nb 2/3)O 3-PbTiO 3 (PZNT) and Pb(Mg 1/3Nb 2/3)O 3-PbTiO 3 (PMNT) rhombohedral crystals (T c ∼ 150-170°C, T R-T ∼ 60-120°C) using minor dopant modifications were limited, with little success. Of significant potential are crystals near the morphotropic phase boundary in the Pb(Yb 1/2 Nb 1/2)O 3-PbTiO 3 (PYNT) system, with a T c > 330°C, even though T R-T was found to be only half that value at ∼160°C. Single crystals in the novel BiScO 3-PbTiO 3 system offer significantly higher T cs > 400°C, while exhibiting electromechanical coupling coefficients k 33 > 90% being nearly constant till the T R-T temperature around 350°C, which greatly increases the temperature range for transducer applications.
AB - The temperature behavior of various relaxor-PT piezoelectric single crystals was investigated. Owing to a strongly curved morphotropic phase boundary, the usage temperature of these perovskite single crystals is limited by T R-T - the rhombohedral to tetragonal phase transformation temperature - which occurs at significantly lower temperatures than the Curie temperature T C. Attempts to modify the temperature usage range of Pb(Zn 1/3Nb 2/3)O 3-PbTiO 3 (PZNT) and Pb(Mg 1/3Nb 2/3)O 3-PbTiO 3 (PMNT) rhombohedral crystals (T c ∼ 150-170°C, T R-T ∼ 60-120°C) using minor dopant modifications were limited, with little success. Of significant potential are crystals near the morphotropic phase boundary in the Pb(Yb 1/2 Nb 1/2)O 3-PbTiO 3 (PYNT) system, with a T c > 330°C, even though T R-T was found to be only half that value at ∼160°C. Single crystals in the novel BiScO 3-PbTiO 3 system offer significantly higher T cs > 400°C, while exhibiting electromechanical coupling coefficients k 33 > 90% being nearly constant till the T R-T temperature around 350°C, which greatly increases the temperature range for transducer applications.
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U2 - 10.1109/TUFFC.2005.1428037
DO - 10.1109/TUFFC.2005.1428037
M3 - Article
C2 - 16060503
AN - SCOPUS:19344369688
SN - 0885-3010
VL - 52
SP - 564
EP - 568
JO - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
JF - IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
IS - 4
ER -