Aluminum nitride sintered body, metal embedded article, electronic functional material and electrostatic chuck
First Claim
1. An aluminum nitride sintered body comprising at least one rare earth element in a total amount (as oxide thereof) of between 150 ppm and 0.5%, by weight, at least one metal impurity except rare earth elements in a total amount of not more than 900 ppm, carbon in a total amount of not more than 0.05% by weight, and oxygen in an amount such that the difference between the total oxygen content in the aluminum nitride sintered body and the oxygen content in one or more oxides converted from said rare earth element is between 0.5% and 2.0% , by weight, in which the aluminum nitride sintered body has a relative density of not less than 98.5%, exhibiting only peaks based on AlN single phase detected by an X-ray diffraction method, and exhibiting a main peak in a wavelength range between 350 nm and 370 nm in a spectrum obtained by a cathode luminescence method, and a volume resistivity at room temperature of between 1.0×
- 106 and 1.0×
1012 Ω
·
cm.
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Accused Products
Abstract
In AlN crystal grains constituting a sintered body, is contained: 150 ppm-0.5 wt. %, preferably at most 0.1 wt.%, of at least one rare earth element (as oxide thereof); at most 900 ppm, preferably at most 500 ppm of at least one metal impurity except rare earth elements; and preferably at least 0.5 wt. % of oxygen measured by an electron probe X-ray microanalyzer. The grains have an average grain diameter of preferably at least 3.0 μm and show a main peak in the wavelength range of 350-370 nm of spectrum obtained by a cathode luminescence method. The sintered body composed of AlN crystal grains has a volume resistivity at room temperature of at most 1.0×1012 Ω·cm.
151 Citations
19 Claims
-
1. An aluminum nitride sintered body comprising at least one rare earth element in a total amount (as oxide thereof) of between 150 ppm and 0.5%, by weight, at least one metal impurity except rare earth elements in a total amount of not more than 900 ppm, carbon in a total amount of not more than 0.05% by weight, and oxygen in an amount such that the difference between the total oxygen content in the aluminum nitride sintered body and the oxygen content in one or more oxides converted from said rare earth element is between 0.5% and 2.0% , by weight, in which the aluminum nitride sintered body has a relative density of not less than 98.5%, exhibiting only peaks based on AlN single phase detected by an X-ray diffraction method, and exhibiting a main peak in a wavelength range between 350 nm and 370 nm in a spectrum obtained by a cathode luminescence method, and a volume resistivity at room temperature of between 1.0×
- 106 and 1.0×
1012 Ω
·
cm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- 106 and 1.0×
Specification