The incorporation method was employed to produce potassium sodium niobate [KNN] (K0.5Na0.5NbO3) glass ceramics from the KNN-SiO2 system. This incorporation method combines a simple mixed-oxide technique for producing KNN powder and a conventional melt-quenching technique to form the resulting glass. KNN was calcined at 800°C and subsequently mixed with SiO2 in the KNN:SiO2 ratio of 75:25 (mol%)...

In the mid-twentieth century, Dr. Donald Stookey identified the importance and usability of nucleating agents and mechanisms for the development of glass-ceramic materials. Today, a number of various internal and surface mechanisms as well as combinations thereof have been established in the production of glass-ceramic materials. In order to create new innovative material properties, the presen...

Abstract Influence of nano-glass powder on physico-mechanical properties geopolymer composite materials has been studied, in addition to studying their firing stability against high temperature from 500 up 1000 °C. For increasing mechanical, physical as well for metakaolin composites; Nano-glass was used. Alumino-silicate are kaolin, fired kaolin (metakaolin) and limestone all pass 75 µm. Mater...

the effects of five different foods including: blood worm, artemia cyst, artemia mass powder, gammarus mass powder and ordinary commercial food were studied on siamese fighting fish (bettasplendens) propagation efficiency during thirty days in a randomize totally design with 4 repeats .experimental plots had been consisted of twenty 30*30*40 (cm) aquarium which a pair of male and female brood s...

Germania glass was prepared from high purity GeO2 powder. Refractive-index dispersion was used to calculate material dispersion and to provide a model for representing the dispersion of GeO2-SiO2 glasses. The wavelength of zero material dispersion is found to be in agreement with theoretical calculations. Modal propagation is modeled for a GeO2 core-silica clad fiber. Results support compositio...

The in vivo disintegration of luting cements was determined at 6- and 12-month intervals in two test series of 20 participants each. Four cements were inserted in the wells located in the mesial and distal surfaces of cast crowns. Glass ionomer, silicophosphate, polycarboxylate, and zinc phosphate cements prepared with recommended powder/liquid ratios are discussed, and are ranked with respect ...