CERAMIC INSULATING MATERIAL AND SENSOR ELEMENT CONTAINING THIS MATERIAL

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The invention relates to a ceramic insulating material, particularly for sensor elements for determining the concentration of gas components in gas mixtures, which is based on an alkaline earth-containing ceramic. The insulating material contains a hexaaluminate of the alkaline earth metal and at least one mixed compound of the alkaline earth metal with an acid oxide, whereby the molar ratio of hexaaluminate to the sum of mixed compounds in the insulating material ranges from 1.3 to 4.0.