Hadith.4442 - Al-Hasan ibn Mahbub narrated from Abdullah ibn Sinan, who said
I asked Abu Abdullah (as) about a man who freed his female slave and made her emancipation her dowry, then divorced her before consummating the marriage.
Imam (as) said: "Her emancipation has taken effect, and her master reclaims half of her value, which she must work to pay off. She has no waiting period ('iddah) upon him."