INVESTIGATION ON SURFACE FEATURE OF NEODYMIUM YTTRIUM ALUMINIUM TETRABORATE CRYSTAL

Ⅰ. INTRODUCTION Neodymium yttrium aluminium tetraborate [NdxY1-xAL （BO3）4, （NYAB）] is a functional material which is self-activated and self-frequent doubling. It belongs to an incongruent compound in the phase diagram, so the flux method is used for its crystal growth.