Relation between chemical, mechanical, and electrical properties of Nb2O5-modified 95 mol % PbZrO3-5 mol % PbTiO3
The use of an Nb2O5-modified PZT (containing approx. =95 mol% zirconate and approx. =5 mol % titanate) in explosively driven electrical power supplies is described. A small but significant number of test specimens exhibit dielectric breakdown during explosive testing. A failure mechanism is proposed in which the electromechanically induced stresses result in fracture. Charged particles released during the fracture process initiate dielectric failure. The fracture toughness and mechanical strength of a given material are about the same for unpoled and poled material, but after pressure depoling, a given material typically exhibits a nominal 50% increase in toughness and strength. Varying the lead concentration from approx. =5 at. % deficiency to approx. =2 at. % excess results in a degradation in toughness and strength. An optimum niobium concentration is observed at approx. =1.8 at. % in terms of mechanical properties and functional performance.
- Research Organization:
- Sandia National Laboratories, Albuquerque, New Mexico
- OSTI ID:
- 6197279
- Journal Information:
- J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 68:10; ISSN JACTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
200104 -- Fossil-Fueled Power Plants-- Components
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BREAKDOWN
CHALCOGENIDES
CHEMICAL PROPERTIES
DESTRUCTIVE TESTING
ELECTRICAL PROPERTIES
ELECTROMECHANICS
ELECTRONIC EQUIPMENT
EQUIPMENT
FAILURES
FRACTURE MECHANICS
FRACTURE PROPERTIES
LEAD COMPOUNDS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICS
METALLURGICAL EFFECTS
NIOBIUM COMPOUNDS
NIOBIUM OXIDES
OPTIMIZATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWER SUPPLIES
PZT
REFRACTORY METAL COMPOUNDS
STRESS ANALYSIS
TESTING
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONATES
ZIRCONIUM COMPOUNDS