Yttrium Aluminum Oxide YAlO3 Single Crystal Substrates YAP - Video

Yttrium aluminium perovskite (YAlO3, aka YAP) are commonly used and studies in lasing applications in thin film and single crystal form typically with the addition of rare earth and transition metal ions. As a substrate, YAP have stabilize many thin films including high temperature superconductors.

With a lattice parameter which is large than most perovskites, and it's orthorhombic structure, the various orientations give lots of different options for lattice matches which many other substrates simply can't, so you often see it being used with rare earths and large lattice parameter films and dopants. This larger lattice parameter can also be used to drive strain in the deposited film.