Acoustic Detection of Ferroelectric Phase Transitions in PLZT Ceramics
Acoustic Detection of Ferroelectric Phase Transitions in PLZT Ceramics
复制标题
PLZT 陶瓷中铁电相变的声学检测
DOI：
10.1111/j.1151-2916.1972.tb13414.x
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发表时间：
1972
影响因子：
3.9
通讯作者：
H. M. O'bryan
中科院分区：
文献类型：
--
作者：
J. T. Krause;H. M. O'bryan
利用脉冲回波技术对掺镧的锆钛酸铅铁电陶瓷(PLZT)进行了20 MHz的声学测试。在极化和未极化的Pb1.02-xLax(Zr0.65Ti0.35)O_3中检测到了-269°~300°C的相变，x=0.00~0.15。对于x=0.00到0.08，在0°到100°C之间观察到的相变定义为纵向声速变化高达5%并伴随着明显的吸收峰。极化样品的共振和机电耦合测量表明，这一转变包括两个铁电相。所报道的声学技术使探测PLZT陶瓷中更微妙的相变成为可能，其灵敏度比更传统的技术高得多。极化样品和未极化样品都可以用这种技术进行测试，因此可以显示磁畴取向对观察到的相变的影响。
Lanthanum-doped lead zirconate-titanate ferroelectric ceramics (PLZT) were tested acoustically using the pulse-echo technique at 20 MHz. Phase transitions occurring within the range –269° to 300°C were detected in poled and unpoled Pb1.02-xLax(Zr0.65Ti0.35)O3 with x=0.00 to 0.15. For x=0.00 to 0.08 a phase transition observed between 0° and 100°C was defined by changes in the longitudinal sound velocity as great as 5% accompanied by pronounced absorption peaks. Measurements of resonance and electromechanical coupling in poled samples indicate that this transition involves 2 ferroelectric phases. The acoustic techniques reported made possible the detection of the subtler phase transitions in PLZT ceramics with a degree of sensitivity much higher than that available from the more conventional techniques. Both poled and unpoled samples may be tested by this technique, so that the influence of domain orientation on the transitions observed can be demonstrated.