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Crystallisation and annealing behaviour of two caesium borosilicate glass samples with approximate boroleucite composition were characterised by means of differential scanning calorimetry measurements as well as X-ray powder diffraction investigations with subsequent profile fitting of the observed patterns according to the Rietveld and/or Pawley method. While one sample crystallised primarily in an orthorhombic phase ( a  = 6.592(3) Å,  b  = 11.825(5) Å,  c  = 12.620(6) Å; possible space groups:  Pmc 2 1  ((26), setting:  P 2 1  am ),  Pma 2 (28) and  Pmma  ((51), setting:  Pmam )) which has been unknown until now and transformed irreversibly into the well-known cubic boroleucite phase at  T  ≈ 850 °C, cubic caesium boroleucite (space group:  Ia 3̅ d  (230)) was crystallised directly from the other sample. In this case, the orthorhombic phase was metastable. At the onset temperature of glass crystallisation  T x   , on  = 770 °C, it existed only for about 75 min. The change of the lattice parameter  a  of the cubic unit cell of caesium boroleucite in the course of the thermal treatments was explained by the alteration of the size of the TO 4  tetrahedra (T = Si, B).

Crystallisation of caesium borosilicate glasses with approximate boroleucite composition