High‐Temperature Modification of Barium Feldspar

Abstract

Synthesis of barium feldspar (BaO · Al 2 O 3 · 2SiO 2 ) from barium carbonate and kaolin was performed by the electrofusion method in order to study its application to ceramic purpose. During the investigation of the properties of the synthesized crystal, the authors happened to be able to furnish conclusive data on the existence of different modifications from the natural celsian. The clarifications of the crystallographic properties, crystal structure, and thermal properties proved the existence of hexagonal modification for high‐temperature form against the monoclinic celsian for low‐temperature form, as well as the α→β transformation in the hexagonal modification at about 300 °C.