The differential scanning calorimetry (DSC) analysis of Rb 2 HAsO 4 ⋅Te(OH) 6 (RbAsTe) material shows three phase transitions at 332K, 464K and 476K. In order to identify the first phase transition, we have conducted the X-ray single crystal analysis at high temperature (363K). X-ray powder diffraction and Raman studies at different temperatures confirmed the presence of the phase transitions in this material as well as the presence of reconstructive phase transition, with such considerable changes of structural parameters. In fact, at T=363K, the crystal structure of (RbAsTe) is found to crystallize in the monoclinic system I2/a with the following cell parameters: a=16.7279(11)Å, b=7.1339(6)Å, c=12.4841(10)Å, β=90.295(6)°, Z=8, V=1489.5(2)Å 3 . At this temperature, the structure is made up of planes of TeO 6 groups alternating with those of AsO 4 polyhedra. The Rb + cations are intercalated between these pure planes.The increase in temperature affected the structural arrangement in which the coordinated polyhedra are distorted and the “a” lattice cell dimension increases with a slight variation of the other parameters. The planes of octahedra and tetrahedra were parallel to the c direction like those in the structure at room temperature but the planes formed by the cations atoms changed their direction.