Stress effects in two modified lead zirconate titanate ferroelectric ceramics
Mechanical properties of ferroelectric ceramics with compositions Pb/sub 0.99/Nb/sub 0.02/(Zr/sub 0.95/Ti/sub 0.05/)/sub 0.98/O/sub 3/ and Pb/sub 0.97/La/sub 0.02/(Zr/sub 0.92/Ti/sub 0.08/)O/sub 3/ have been studied as functions of both hydrostatic pressure and uniaxial stress. Measurements of ultrasonic velocity and sample strains have been made in order to characterize unpoled samples. Both materials have pressure-induced ferroelectric (FE) to antiferroelectric (AFE) phase transitions at approx.0.2 GPa of hydrostatic pressure. Under uniaxial-stress conditions two effects are observed: rotation of FE domains and the FE--AFE phase transition. These effects are separately resolved by the measurements, even though they occur in overlapping stress regions. The domain reorientation responses of the two materials appear to be nearly identical, but the FE--AFE transition begins at lower stress levels for the Nb-doped material. This is presumably due to that material transforming into the orthorhombic (PbZrO/sub 3/) phase, whereas the La-doped material transforms into the tetragonal AFE phase. The phase transition is spread over a broad range of uniaxial stress for each material and is not nearly complete by 0.6 GPa, the highest stress level attainable. Possible implications of the results for shock-wave studies of FE ceramics are briefly discussed.
- Research Organization:
- Sandia Laboratories, Albuquerque, New Mexico 87185
- OSTI ID:
- 5994002
- Journal Information:
- J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 50:8; ISSN JAPIA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Phase transformation of "chem-prep" PZT 95/5-2Nb HF1035 ceramic under quasi-static loading conditions.
Pressure Induced Phase Transformation of Pb(Zr(0.95)Ti(0.05))O(3) Based Ceramics: Grain Size Dependence
Related Subjects
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CERAMICS
DATA
DIELECTRIC MATERIALS
FERROELECTRIC MATERIALS
HYDROSTATICS
INFORMATION
LEAD COMPOUNDS
MATERIALS
MECHANICAL PROPERTIES
ORIENTATION
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
QUANTITY RATIO
SOUND WAVES
STRESSES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ULTRASONIC WAVES
VERY HIGH PRESSURE
ZIRCONATES
ZIRCONIUM COMPOUNDS