Ohio Rev. Code Ann. § 5301.26

As between the vendor and vendee of land the vendor shall have a lien for so much of the purchase money as remains unpaid. Such lien shall not be effective as against a purchaser, mortgagee, judgment creditor, or other encumbrancer, unless there is a recital or a reservation of the lien in the deed, or in some instrument of record executed with the same formalities as are required for the execution of deeds and mortgages of land. The vendor waives his lien by taking a mortgage for any unpaid purchase money on the land conveyed or any part thereof, and the filing for record of such a mortgage with the county recorder of the county in which said land is located shall be constructive notice of the waiver of the vendor's lien.