Investigation of the dielectric and thermal properties of sintered Li/sub 1-//sub x/Ta/sub 1-3//sub x/Ti/sub 4//sub x/O/sub 3/ solid solution ceramics
A series of twelve Li/sub 1-//sub x/Ta/sub 1-3//sub x/Ti/sub 4//sub x/O/sub 3/ solid solution ceramics was sintered following the low-temperature metal alkoxide routes. Measurements of dielectric constants, dielectric losses, and heat capacities as functions of temperature and frequency are presented. The Curie temperature (T/sub C/) in comparison to LiTaO/sub 3/ was reduced from 620 /sup 0/C to about 358 /sup 0/C in the Li/sub 0.91/Ta/sub 0.73/Ti/sub 0.36/O/sub 3/ ceramics. The heat capacity data showed no dependence on the bulk density or grain size. Also the mechanical properties of the undoped crystals appear to stay undisturbed. On the other hand, an apparently abnormal dependence of the Curie temperature on density was found. Heat capacity and dielectric loss decreased while the dielectric constant increased with the addition of Ti/sup +4/ doping in the LiTaO/sub 3/ structure. Overall, a good detector performance might indeed be obtained from these ceramic materials if they can be poled reproducibly.
- Research Organization:
- Center for Night Vision and Electro-Optics, Fort Belvoir, Virginia 22060-5677
- OSTI ID:
- 6254658
- Journal Information:
- J. Mat. Res.; (United States), Vol. 2:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LITHIUM OXIDES
CURIE POINT
DIELECTRIC PROPERTIES
SPECIFIC HEAT
TANTALUM OXIDES
TITANIUM OXIDES
CERAMICS
EXPERIMENTAL DATA
FREQUENCY DEPENDENCE
GRAIN SIZE
HIGH TEMPERATURE
HZ RANGE
KHZ RANGE 01-100
MEDIUM TEMPERATURE
SINTERING
SOLID SOLUTIONS
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL STRUCTURE
DATA
DIFFRACTION
DISPERSIONS
ELECTRICAL PROPERTIES
FABRICATION
FREQUENCY RANGE
INFORMATION
KHZ RANGE
LITHIUM COMPOUNDS
MICROSTRUCTURE
MIXTURES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
SCATTERING
SIZE
SOLUTIONS
TANTALUM COMPOUNDS
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
360204* - Ceramics
Cermets
& Refractories- Physical Properties