Schott Ceran isnt a make of hob. All the do is make glass tops for most of the brands out there so im afraid we will need the make and model number to be able to find the part for you.
Are you able to access the underside of the hob? If so then there will be a sticker under there with all the info we need to get the part.
So if you can you need to post that info for us to have any chance of finding the part for it.