In　this　study,　aluminum　isopropoxide　(AIP)　served　as　a　sintering　additive,　and　0–10　at%　AIP:YAG　transparent　ceramics　were　fabricated　through　vacuum　sintering　within　the　temperature　range　of　1650–1790　°C.　It　was　found　that　after　undergoing　calcination　at　800　°C,　AIP　transformed　into　a　nanoscale　γ-Al2O3　coating　layer　on　the　surface　of　the　precursor　particles　within　the　YAG　green　compacts.　This　γ-Al2O3　coating　layer　not　only　accelerated　the　phase　transformation　rate　of　YAG　but　also　boosted　the　densification　rate　of　YAG　ceramics　when　the　temperature　was　below　1700　°C.　Moreover,　AIP　was　ultimately　converted　into　α-Al2O3,　thereby　preventing　the　introduction　of　impurity　ions.　A　doping　concentration　of　1.0–1.5　at%　has　been　validated　as　an　optimal　range　for　AIP　in　YAG　ceramics.　The　in-line　transmittance　of　1.0–1.5　at%　AIP:YAG　ceramics　was　significantly　higher　than　that　of　0　at%　AIP:YAG　ceramic　at　1700　°C.　While　the　temperature　was　further　increased　to　1790　°C,　the　positive　effect　of　AIP　became　less　pronounced.　These　findings　indicate　that　AIP　holds　great　promise　as　a　sintering　activity　promoter　for　YAG　transparent　ceramics.　©　2025　Elsevier　Ltd　and　Techna　Group　S.r.l.