Is a divorce effective upon merely entering the marital home by saying "I will divorce her," knowing that the husband did not utter explicit formulas of divorce?

If the statement you uttered was "unless I divorce her," intending it as a promise of divorce, then no divorce takes place by it, and you are not obligated to fulfill this promise. However, if you swore an oath by Allah that you would divorce her, then an expiation for breaking an oath is incumbent upon you. The statement "I informed my wife that I would divorce her" is also a promise of divorce and does not constitute a divorce. If you are in doubt about the formulation of a contingent divorce, the original state is the continuation of the marital bond, because certainty is not removed by doubt. It is important to note that the ruling on the divorce of an angry person varies depending on the degrees of anger. Spouses should avoid marital problems and strive to solve them wisely without resorting to divorce.