Neodymium arsenate, also known as neodymium(III) arsenate, is the arsenate of neodymium with the chemical formula of NdAsO<sub>4</sub>. In this compound, neodymium exhibits the +3 oxidation state. It has good thermaostability, and its pK<sub>sp,c</sub> is 21.86ñ0.11.
Neodymium arsenate can be obtained from the reaction between sodium arsenate (Na<sub>3</sub>AsO<sub>4</sub>) and neodymium chloride (NdCl<sub>3</sub>) in solution:
When crystallizing from a lead pyroarsenate flux, neodymium arsenate crystals produced explode when cooled.
Neodymium arsenate also occurs in nature as a mineral, Arsenoflorencite-(Nd).