Neutron structural and vibrational studies of dipotassium selenate tellurate

Add time:08/30/2019    Source:sciencedirect.com

At room temperature the potassium selenate tellurate K2SeO4·Te(OH)6 (KSeTe) was prepared from water solution of H6TeO6 and K2SeO4. Its structure has been determined from single crystal using neutron diffraction data. KSeTe is monoclinic with C2/c space group. The unit cell parameters are: a = 11.572(9) Å, b = 6.437(7) Å, c = 13.938(1) Å, β = 106.07(7)°, V = 997.7(1) Å3 and Z = 4. The main feature of this structure is the presence of two different and independent anions (TeO66− and SeO42−) in the same unit cell. The structure is built by layers of TeO6 octahedra altering with planes of SeO4 tetrahedra linked by a network of hydrogen bonds performed by protons belonging to the OH hydroxide groups. DSC measurements indicate that the crystals of K2SeO4·Te(OH)6 undergo three endothermal peaks at 433, 480 and 495 K.Raman scattering measurements on KSeTe material taken between 300 and 620 K are reported in this paper. The spectra indicate clearly these phase transitions.

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