Dielectric and elastic properties of mixed ferroelectric material KTa sub 1 minus x Nb sub x O sub 3

Miscellaneous · Tue Jan 01 00:00:00 EST 1991

OSTI ID:5324775

Wang, Xiaomei

This study describes dielectric and elastic properties of the ferroelectric system KTa{sub 1{minus}x}Nb{sub x}O{sub 3} (KTN) with niobium in the concentration range 1.2% {approximately} 16%. Experimental work on the dielectric and elastic behaviors of the KTN system is discussed. Results on the linear and the nonlinear dielectric constants and on the electric polarization of KTN reveal (a) the occurrence of a structural transition with the appearance of ferroelectric macroregions at {Tc}, even for relatively low impurity concentrations (b) the presence of polar microregions significantly above {Tc}. The phase transition in KTN is driven by the interaction between effective dipolar moments d* rather than a soft mode. Elastic results obtained on KTN provide direct evidence of the two distinct stages through which the transition goes when approaching the critical temperature {Tc}.

• Research Organization: Lehigh Univ., Bethlehem, PA (United States)
• OSTI ID: 5324775
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
NIOBIUM OXIDES
DIELECTRIC PROPERTIES
ELASTICITY
POTASSIUM OXIDES
TANTALUM OXIDES
CRITICAL TEMPERATURE
NIOBIUM
PHASE STUDIES
QUANTITY RATIO
ALKALI METAL COMPOUNDS
CHALCOGENIDES
ELECTRICAL PROPERTIES
ELEMENTS
MECHANICAL PROPERTIES
METALS
NIOBIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
REFRACTORY METAL COMPOUNDS
TANTALUM COMPOUNDS
TENSILE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
360204* - Ceramics
Cermets
& Refractories- Physical Properties
360203 - Ceramics
Cermets
& Refractories- Mechanical Properties