Hafnium alloy target
View Patent ↗A hafnium alloy target containing either or both of Zr and Ti in a gross amount of 100 wtppm-10 wt % in Hf, wherein the average crystal grain size is 1-100 μm, the impurities of Fe, Cr and Ni are respectively 1 wtppm or less, and the habit plane ratio of the plane {002} and three planes {103}, {014} and {015} lying within 35° from {002} is 55% or greater, and the variation in the total sum of the intensity ratios of these four planes depending on locations is 20% or less. As a result, obtained is a hafnium alloy target having favorable deposition property and deposition speed, which generates few particles, and which is suitable for forming a high dielectric gate insulation film such as HfO or HfON film, and the manufacturing method thereof.
1. A hafnium alloy target containing Zr and Ti in a gross amount of 100 wtppm-10 wt % in Hf, and having a habit plane ratio of a plane {002} and of three planes {103}, {014} and {015} lying within 35° from {002} of at least 55%, a variation in a total sum of intensity ratios of these four planes depending on locations of 20% or less, an average crystal grain size of 1-100 μm, impurities of Fe, Cr and Ni of 1 wtppm or less, respectively, and an average roughness Ra of an erosion face of said target of 0.01-2 μm.
2. A hafnium alloy target according to claim 1 , wherein a non-erosion face of said target has an average roughness Ra of 2-50 μm.