“…The increase of the measured characteristic temperatures and the calculated thermal stability in such glasses may be attributed to the ongoing replacement of the weak O─V─O bonds by the strong O─As─O ones. [9,60,61] On the other hand, this may reflect the steady Water groups [37,38] From 3000 to 2000 ─OH groups [48,49,50] Around 1772 H─O─H bending [36,48] At 1620 and 1640 Stretching vibration of H─O bond [39] Around 1445 Non-bridging oxygen anions of the form ─V─O À [51] From 1110 to 1060 Symmetric stretching vibrations of AsO 3 units [44,45,52,53] At about 1020 Vibrations of the VO 2groups of the VO 5 group [39] At about 1000 V─O─As common vibrations [54] From 990 to 940 Vibrations of VO 2groups of the VO 4 polyhedra [55] At about 790 Doubly degenerated stretching vibrations of AsO 3 groups [44,45] At about 613 Symmetric bending vibrations of AsO 3 groups due to FeO 4 tetrahedra, [1] this suggests that a vibration of As─O─Fe linkages may be exist…”