Method of Making a Resonator from a Boule of Lithium Tetraborate and Resonator So Made.
Patent Application, Filed 13 Sep 89,
DEPARTMENT OF THE ARMY WASHINGTON DC
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This invention relates in general to a method of making a temperature compensated resonator and to the resonator so made, and in particular to a method of making a temperature compensated resonator from a boule of lithium tetraborate and to the resonator so made. Lithium tetraborate, Li2B4O7, is an insulating dielectric material that is piezoelectric but is not ferroelectric. This means that it is capable of being mechanically stimulated into vibration piezolectric effect but it is not necessary to subject the material to poling such as would be required for a ferroelectric material such as lithium niobate LiNbo3. Furthermore, Li2B4O7 is not enantiomorphous. This means that it does not have the disadvantage of twinning as quartz Li2B4O7 has moderate piezoelectric coupling and orientations at which the first order temperature coefficient of frequency is zero. The general object of this invention is to provide a resonator characterized by frequency insensitivity to temperature variations. A more particular object of the invention is to provide a resonator in which both the first- and the second-order temperature coefficient of frequency are substantially zero. Patent application. RRH
- Electricity and Magnetism