Pyroelectric crystals with high figures of merit
AssigneeResearch Corporation
InventorsChang-Shui Fang, Yao Xi, Zhi-Xiong Chen, Amar S. Bhalla, Leslie E. Cross
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Abstract
Pyroelectric crystals having relatively high figures of merit (p/K) of the order of 1.8 or more are provided. They are preferably prepared by doping alanine substituted triglycine sulfate crystals with phosphorous and/or arsenic.
Claims18
A pyroelectric crystal having a p/K value of .gtoreq.1.8.
A pyroelectric crystal having a p/K value of .gtoreq.2.0.
A triglycine sulfate based pyroelectric crystal having a p/K value of .gtoreq.1.8.
A triglycine sulfate based pyroelectric crystal having a p/K value of .gtoreq.2.0.
An alanine doped triglycine sulfate based pyroelectric crystal having a p/K value of .gtoreq.1.8.
A triglycine based pyroelectric crystal doped with alanine and one or both of arsenic and phosphorous in compound form and having a p/K value of .gtoreq.1.8.
A triglycine sulfate based pyroelectric crystal doped with alanine and a compound of an element of Group VA of the periodic table having an atomic number of at least 15 and having a p/K value of .gtoreq.1.8.
In a pyroelectric device employing a pyroelectric crystal element, the improvement comprising employing as said element a (010) plate cut from a (010) face of a triglycine sulfate based pyroelectric crystal having a p/K value of .gtoreq.1.8.
A crystal having a composition selected from the group consisting of
- (3-x)(glycine).x(alanine).(1-y)(H.sub.2 SO.sub.4).yH.sub.3 PO.sub.4
- and
- (3-a)(glycine).a(alanine).1-b(H.sub.2 SO.sub.4).bH.sub.3 AsO.sub.4
- wherein
- x is about 0.05 to 0.3,
- y is about 0.05 to 0.5,
- a is about 0.05 to 0.3, and
- b is about 0.05 to 0.5.
Dependencies are inferred from the claim text.