Positive electrode body for tungsten capacitors

The present invention provides a positive electrode body for electrolytic capacitors, which is obtained by sintering a tungsten powder into a sintered body and subjecting the sintered body to chemical conversion, thereby forming a dielectric layer composed of a tungsten trioxide compound on the surface of the sintered body, and which is characterized in that the ratio of hydration water in the tungsten trioxide compound is one molecule or less per 10 molecules of the tungsten trioxide compound. A tungsten capacitor which is reduced in the capacitance change due to DC voltage (bias dependence) can be produced using a positive electrode body according to the present invention. 本发明提供种电解电容器阳极体，其特征在于，是通过将钨粉烧结而形成烧结体，对所述烧结体进行化学转化，从而在表面形成了由三氧化钨化合物构成的电介质层的电容器阳极体，所述三氧化钨化合物中的水合水的比例是相对于10个三氧化钨化合物分子为1个分子以下。通过使用本发明涉及的阳极体，能够制作相对于DC电压的电容量变化(偏电压依赖性)降低了的钨电容器。