Crystal Structure and Characterization of CsH5(AsO4)2: A New Cesium Pentahydrogen Arsenate, and Comparison with CsH5(PO4)2 and RbH5(AsO4)2

Studies on a new Rb3H9(PO4)4 crystal

“…It is assumed that the crystal does not exhibit any structural phase transition in this temperature range. These results are very similar to those obtained in the RbH 5 (AsO 4 ) 2 and CsH 5 (AsO 4 ) 2 crystals [11,12]. These crystals do not exhibit any structural phase transition in the temperature ranges (100-575 K in RbH 5 (AsO 4 ) 2 and 123-473 K in CsH 5 (AsO 4 ) 2 ), but undergo the melting transitions at 410 and 427 K, respectively.…”

Development of Novel Proton Conductors Consisting of Solid Acid/pyrophosphate Composite for Intermediate-temperature Fuel Cells

“…14 30) . The DTA profiles of all sam ples showed a large endothermic peak in the tempera ture range of -5℃, which can be assigned to the melting of CsH5(PO)2 20) . The melting point was shifted to lower temperature for composites, indicating that the matrix affected the state of CsH5(PO)2.…”

“…Considering the melting point of pure CsH5(PO)2 (ca. 50℃) 20) , the former and latter peaks s h o u l d b e a s s i g n e d t o t h e m e l t i n g p r o c e s s o f CsH5(PO)2 and the condensation with dehydration of phosphates in dry nitrogen, respectively. This assign ment agreed well with the XRD patterns: the lines assigned to CsH5(PO)2 disappeared, whereas SiP2O phase showed no change above 30℃.…”

Crystal structure, thermal behavior and vibrational studies of tetraethylammonium dihydrogenarsenate bis-arsenic acid [(C2H5)4N].[H2AsO4].[H3AsO4]2

“…The vibrational analysis of an isolated arsenate, phosphate anion AsO4 3-, with Td point group symmetry leads to four Raman active normal modes: ν1(A1), ν2(E), ν3(F2) and ν3(F2) with average wavenumbers 837, 349, 887 and 463 cm -1 , respectively [26]. ν1 and ν3 involve the symmetric and the antisymmetric stretching mode of the As-O bonds, whereas ν2 involve mainly O-As-O, symmetric and anti-symmetric bending modes.…”