Synthesis, structure determination and calorimetric study of new caesium hydrogen selenate arsenate Cs4(SeO4)(HSeO4)2(H3AsO4)

The infrared spectra of the new compound Cs4(SeO4)(HSeO4)2(H3AsO4) recorded at room temperature in the frequency range 4000-400 cm−1 confirm the presence of AsO43− and SeO42− groups in the same crystal. The differential scanning calorimetry (DSC) and the thermogravimetry (TG) curves show two phase transitions at 411 and 418 K in this material.