Mechanical Loss and Elastic Modulus Associated with Phase Transitions in PLZT Ceramics

Mechanical Loss and Elastic Modulus Associated with Phase Transitions in PLZT Ceramics

The phase transition in lanthanum modified lead zirconate-titanate ceramic of 6/60/40 is studied by mechanical loss Q-I and elastic modulus measurements. The shear elastic modulus measured from 50°C to 250°C shows that the Curie temperature is located at 180°C for the transition from cubic to rhombohedral phase. The Q-' curves at low frequencies show clearly a peak corresponding to such phase t...

Elastic Modulus and Mechanical Loss Associated with Phase Transitions and Domain Walls Motions in PZT Based Ceramics

Elastic modulus (shear modulus G or Young's modulus E) and internal friction Q-' were measured as a function of temperature on undoped Pb(Zr50Ti50)03, Pb(Zr,2Ti.,,)03 , Pb(Zr5,Ti,)0, ceramics from -180°C to 500°C. Experiments were performed at low and medium frequencies (0.1 Hz 4 kHz). The E(T) curves show two anomalies which are due to following phase transitions: tetragonal to cubic (Tc) and ...

Characterization of PLZT Ceramics for Optical Sensor and Actuator Devices

Pyroelectric energy conversion using PLZT ceramics and the ferroelectric–ergodic relaxor phase transition

This paper is concerned with direct conversion of waste heat into electricity by executing the Olsen cycle on lead lanthanum zirconate titanate (PLZT) ceramics undergoing a relaxor–ferroelectric phase transition. The Olsen cycle consists of two isothermal and two isoelectric field processes. First, the temperature-dependent dielectric properties were measured for x/65/35 PLZT. The polarization ...

Preparation and characterization of transparent PZN–PLZT ceramics

Transparent Pb(Zn1/3Nb2/3)O3–(Pb1-xLax)(Zr1-yTiy)O3 (PZN–PLZT) ferroelectric ceramics have successfully been prepared by hot-pressed sintering in oxygen atmosphere. Uniform cylindrical samples with diameter as large as 50 mm can readily be obtained. X-ray analysis and scanning electron microscopy experiments showed a pure perovskite phase, thin grain boundaries, and uniform dense microstructure...