Single crystals of lead magnesium niobate-lead titanate

C - Chemistry – Metallurgy – 30 – B

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C30B 15/10 (2006.01) C30B 11/00 (2006.01) C30B 15/20 (2006.01)

Patent

CA 2421753

A method of making a single crystals of lead magnesium niobate-lead titanate (PMN-PT). The method includes providing a flat-bottomed iridium crucible containing PMN-PT starting material, and placing the crucible into a vertical Bridgman furnace having at least two temperature zones, which is subsequently pressured with an inert gas. The crucible then descends into the temperature zones of the vertical Bridgman furnace. The temperature zones of the vertical Bridgman furnace include a first temperature zone having a temperature higher than a melting temperature of the PMN-PT material and a second temperature zone having a temperature less than the melting temperature of the PMN-PT material. The single crystals of PMN-PT prepared using the above-described method exhibits a [110] crystal orientation and may be used in electroacoustic transducers. The electroacoustic transducers are useful in devices that detect or generate acoustic waves.

L'invention concerne un procédé de fabrication de cristaux uniques de titanate niobate-plomb magnésium plomb (PMN-PT). Le procédé décrit consiste à produire un creuset iridium à fond plat contenant une matière première PMN-PT, puis à placer le creuset dans un four Bridgman vertical possédant au moins deux zones de température, qui est ensuite mis sous pression par un gaz inerte. Le creuset descend ensuite dans les zones de température du four Bridgman vertical. Les zones de température du four Bridgman vertical comportent une première zone de température dont la température est supérieure à la température de fusion du matériau PMN-PT et une seconde zone de température dont la température est inférieure à la température de fusion du matériau PMN-PT. Les cristaux uniques de PMN-PT préparés au moyen du procédé décrit ci-dessus présentent [110] une orientation de cristal et peuvent être utilisés dans des transducteurs électroacoustiques. Ceux-ci servent à détecter ou générer des ondes acoustiques.

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