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Polycrystalline CsBSi 5 O 12  was prepared from a stoichiometric mixture by solid-state reaction above 1000 °C. The solid solutions Cs 1–x Rb x BSi 5 O 12  were obtained at 1000 °C during a long heat treatment of polycrystalline Cs 1–x Rb x BSi 2 O 6  boropollucites ( x  Rb  = 0, 0.05, 0.2, 0.4). A new borosilicate compound and its solid solutions were studied using X-ray powder diffraction (XRD), annealing, differential scanning calorimetry (DSC), and thermogravimetry (TG). For Cs,Rb-boropollucites the new phase formation is accompanied by significant mass losses detected by DSC and TG. The following mechanism of phase transformations is assumed: (Cs,Rb)BSi 2 O 6  → (Cs,Rb)BSi 5 O 12  + (Cs,Rb)BO 2 ↑. The zeolite phase forms as a result of the boropollucite decomposition over 1000 °C. Zeolite decomposes also on further heating and the SiO 2  reflections are observed in the XRD pattern only. Thus above 1000 °C both boropollucite and zeolite phases are unstable presumably due to the ability of the alkali cations to leave the structure.

XRD and DSC study of the formation and the melting of a new zeolite like borosilicate CsBSi 5 O 12 and (Cs,Rb)BSi 5 O 12 solid solutions