Patent ID: 8911600
Filing Date: 2014-12-16
Classification: C04B,C23C

Abstract:
1. A method of storing a sputtering target made of lanthanum oxide, wherein a lanthanum fluoride film is formed in advance on the surface of the lanthanum oxide target to be stored by applying hydrofluoric acid treatment to the lanthanum oxide target, the lanthanum oxide target to which the lanthanum fluoride film was formed and lanthanum oxide powder are placed into a container, and the container is thereafter subject to vacuum suction and sealing to form a vacuum-sealed package which has an oxygen transmission rate of 0.1 cm 3 /m 2 per 24 h at 1 atm or less and a moisture vapor transmission rate of 0.1 g/m 2 per 24 h or less, wherein the lanthanum oxide target has a purity of 3N (99.9%) or higher and a content of C as a gas component of 100 or less.