文摘
Single crystals of the new compounds M2Ca3B16O28 (M: Rb, Cs) are grown from melts containing Rb2CO3 or Cs2CO3, CaCl2, H3BO3, and PbO in the molar ratio of 1:1:14:5 (Pt crucible, fast cooling from 700 °C to 610 °C and then cooling to 550 °C at a rate of 2.5 °C/h).