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Disclosed is a circuit substrate and a semiconductor device to which the circuit substrate is applied. The circuit substrate has an insulating layer and an electrically conductive layer. The insulating layer is composed of a sintered aluminum nitride composition containing: aluminum nitride; a first

Disclosed is a circuit substrate and a semiconductor device to which the circuit substrate is applied. The circuit substrate has an insulating layer and an electrically conductive layer. The insulating layer is composed of a sintered aluminum nitride composition containing: aluminum nitride; a first component given by a compound containing an element which is selected from the group consisting of group IIa elements and group IIIa elements of the periodic table; a second component given by either a simple boron or a boron compound; and a third component give by either a simple manganese or a manganese compound. The electrically conductive layer contains: a conductive component given by a metal or an electrically conductive compound for exhibiting electric conductivity; aluminum nitride; the first component; the second component; and the third component. The semiconductor device has the above circuit substrate, a semiconductor element mounted on the circuit substrate, and a cap being tightly bonded to the circuit substrate with a sealing glass to cover the semiconductor element.

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A circuit substrate comprising: an insulating layer composed of a sintered aluminum nitride composition comprising aluminum nitride as a main component, said insulating layer further comprising: a first additive comprising a compound containing a first element which is selected from the group consis

A circuit substrate comprising: an insulating layer composed of a sintered aluminum nitride composition comprising aluminum nitride as a main component, said insulating layer further comprising: a first additive comprising a compound containing a first element which is selected from the group consisting of group IIa elements and group IIIa elements of the periodic table; a second additive comprising either a simple boron or a boron compound; and a third additive comprising either a simple manganese or a manganese compound, and an electrically conductive layer comprising a conductive component as a main component, said conductive component comprising a metal or an electrically conductive compound for exhibiting electric conductivity, said electrically conductive layer further comprising: an additive aluminum nitride; said first additive; said second additive; and said third additive.