Preparation and characterization of fluorphlogopite-fluormuscovite mica glass-ceramics

Determination of the influence of TiO2 on the elastic properties of a mica based glass ceramic by ultrasonic velocity measurements

“…Kingery et al [29] have reported that the density is a minimum value for the pure network former and increases as modifier ions, which increase the number of atoms present without changing the network much, are added. The density values were comparable with the mica based glass ceramics of similar compositions reported by Kodaira et al [4] and Tzeng et al [26].…”

“…Primary interest in these materials was developed due to their machinability [1,2] and biocompatibility [3]. In addition, they posses appropriate chemical, mechanical, thermal, and physical properties [1][2][3][4]. The unique properties result from the uniform, reproducible, fine grained microstructure consisting of easily cleavable and interlocking laminar mica crystals dispersed in a glassy matrix [5,6].…”

“…Some compositions of mica glass ceramics that can be melted and cast into the form of tooth has been marketed under different commercial names such as Dicor [9], Macor [10], and Bioverit [11]. In spite of the good peculiarities of the mica glass ceramics, they are hard to prepare due to their high melting and forming temperatures, large crystallization tendency, phase separation on cooling, and compositional changes due to the fluorine volatilization on melting [4]. Efforts have been continuing to overcome the difficulties in their production and to develop a new mica glass ceramics that will exhibit better performance.…”

“…It is commonly known that the nature of the crystallinity and distribution of the crystalline phase(s) formed during crystallization depends also on the kind and amount of nucleating agent used. Several investigations [2,4,[12][13][14][15][16] conducted on the role of TiO 2 as a nucleating agent in silicate systems have revealed that small addition of TiO 2 to many silicate systems has remarkable influence on the crystallization. The role of TiO 2 as a nucleating agent in mica based glass ceramics have been overlooked since these materials posses fluorine that promotes nucleation.…”