| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a varistor element capable of obtaining a varistor having a small amount of expansion and adhesion of plating reliably. <P>SOLUTION: An ideal varistor element 2 has a configuration, where an internal electrode layer 12 and a varistor layer 14 are laminated alternately. The varistor layer 14 has a composition containing ZnO as a main constituent; and Co, Pr, and Zr as sub constituents. When the varistor element 2 is analyzed in the depth direction from the surface, and a depth position where the content of Zr becomes nearly constant is set to be a reference depth position; the content Z<SB>0</SB>of Zr at the reference depth position, the content Z<SB>1</SB>of Zr at a depth position at a surface side by 2μm from the reference depth position, the content P<SB>0</SB>of Pr at the reference depth position, and the content P<SB>1</SB>of Pr at a depth position at a surface side by 2μm from the reference depth position, satisfy a formula 1: 0.4×Z<SB>1</SB>/Z<SB>0</SB>+0.5≤P<SB>1</SB>/P<SB>0</SB>≤0.4×Z<SB>1</SB>/Z<SB>0</SB>+0.9 and a formula 2: 1<Z<SB>1</SB>/Z<SB>0</SB><2.2. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
