What is the expiation for an oath of divorce, in the case of swearing "divorce be upon me if you go to your uncle" if one intends to go without the divorce taking effect?

If a husband swears an oath of divorce upon his wife, concerning an action or inaction, there are two scenarios: Either he intends to make the divorce conditional, in which case the divorce occurs upon the happening of the sworn-upon event. Or he intends only an oath, in which case he must offer expiation for an oath (kaffarat yamin (definition)). The view of the majority is strong that she is divorced by going to her maternal uncle's house. It is obligatory to avoid swearing an oath of divorce except out of necessity.