Multilayer varistor and method for manufacturing a multilayer varistor

A multilayer varistor comprising:

• a ceramic body having a plurality of inner electrodes, an active region and a near-surface region, at least one first ceramic material and at least one second ceramic material,
• wherein the ceramic materials differ from each other in a concentration of monovalent elements X+ by a maximum of 50 ppm≤Δc(X+)≤5000 ppm,
• wherein X+=(Li+, Na+, K+ or Ag+),
• wherein Δc denotes a maximum concentration difference occurring between the active region and the near-surface region,
• wherein the ceramic body comprises at least three ceramic materials, and
• wherein a third ceramic material is arranged between the first ceramic material and the second ceramic material.

A multilayer varistor comprising:

• a ceramic body having a plurality of inner electrodes, an active region and a near-surface region, at least one first ceramic material and at least one second ceramic material,
• wherein the ceramic materials differ from each other in a concentration of monovalent elements X+by a maximum of 50 ppm≤Δc(X+)≤5000 ppm,
• wherein X+=(Li+, Na+, K+ or Ag+),
• wherein Δc denotes a maximum concentration difference occurring between the active region and the near-surface region, and
• wherein the second ceramic material is doped with 1000 ppm potassium and additionally doped with 1000 ppm La.