Zinc oxide crystal and method of producing same

C - Chemistry – Metallurgy – 30 – B

Patent

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C30B 29/66 (2006.01) C01G 9/02 (2006.01) C30B 25/00 (2006.01) C30B 29/16 (2006.01)

Patent

CA 2082689

A novel zinc oxide crystal has an octahedral nucleus whose faces are alternately zinc faces and oxide faces, and this crystal has such a geometric shape that a needle is grown on each of the faces. The needle grown on the oxide face is branched into three sections which are disposed in parallel relation, and the needle on the oxide face is shorter than the needle on the zinc face. This novel crystal having oxide films can be produced in a homogeneous manner by mixing zinc-tin alloy powder or tin powder with zinc powder, having an oxide film formed on each particle thereof, to form a powder mixture and then by heating the powder mixture at 820°C to 1100°C in an oxidizing atmosphere to oxide the same. The tin concentration in the power mixture is less than 40 wt.%.

Un nouveau cristal d'oxyde de zinc possède un noyau octaédrique dont les faces sont alternativement des faces zinc et faces oxyde, et ce cristal possède une géométrie telle qu'une aiguille croît sur chacune des faces. L'aiguille qui présente sur la face oxyde est ramifiée en trois sections qui sont disposées de manière parallèle, et l'aiguille de la face oxyde est plus courte que l'aiguille de la face zinc. Ce nouveau cristal ayant des films d'oxyde peut être produit d'une manière homogène en mélangeant de la poudre d'alliage zinc-étain ou de la poudre d'étain avec de la poudre de zinc, ayant un film d'oxyde formé sur chacune des particules de ce dernier, pour former un mélange de poudre, puis en chauffant le mélange de poudre à une température de 820 à 1 100 degrés C dans une atmosphère oxydante pour l'oxyder. La concentration d'étain dans le mélange de poudre est inférieure à 40 % en poids.

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