Process for making beta-zinc diphosphide monocrystals (whiskers)
Patent 4692203 Issued on September 8, 1987. Estimated Expiration Date: 
August 25, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 25, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3033659 3210149 InventorsApplicationNo. 06/899941 filed on 08/25/1986US Classes:117/109, Fully-sealed or vacuum-maintained chamber (e.g., ampoule)117/937, INORGANIC CONTAINING SINGLE-CRYSTAL (E.G., COMPOUND, MIXTURE, COMPOSITE) {C30B 29/10}136/265Copper, lead, or zinc containingExaminersPrimary: Dixon, William R. Jr.Assistant: Breneman, R. Bruce Attorney, Agent or FirmInternational ClassC30B 23/00 (20060101)Foreign Application Priority Data1985-09-07 DEAbstractଲ-zinc diphosphide monocrystals (ଲ-ZnP2) (whiskers) having a diameter of at least 7 mm are made. To this end, a quartz ampoule is filled up to 70-90% its volume with polycrystalline ଲ-ZnP2 ; the ampoule is sealed and drawn in upright position at a velocity of 0.5-2.5 mm/day during a period of 24-120 days through a kiln; the temperature outline from below to above in the kiln is defined by a lower inlet temperature of 580°-780° C., a mean maximum temperature of 800°-950° C. and an upper outlet temperature of 350°-400° C.; the ampoule coming from the furnace is crushed and ଲ-ZnP2 condensed into a monocrystal via the gas phase by sublimation into the upper ampoule portion is removed.Other References
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