Crystallization and sinterability of cordierite-based glass powders containing CeO2

Thermal expansion coefficient and dielectric properties of non-stoichiometric cordierite compositions with excess MgO mole ratio synthesized from mainly kaolin and talc by the glass crystallization method

“…Samples with high purity of ␣-cordierite synthesized from pure metal oxide generally have very low dielectric loss <10 −3 at 10 MHz [20,22,33]. However, in this case, higher concentrations of ␣-cordierite phase do not necessarily have low loss.…”

“…This can be explained by the fact that an increase in frequency induces weakening or disappearing of ionic polarization, and consequently decreases dielectric constant values. For glass ceramic materials, many factors will affect the dielectric properties, including the content of the individual crystalline, glass phases, level of porosity, and the degree of densification [33]. The dielectric constant of the samples with different MgO mole ratio is in the range of 5-7.5, from a fre- Fig.…”

Effect of melting temperatures on the crystallization and densification of 2.8MgO·1.5Al2O3·5SiO2 glass–ceramic synthesized from mainly talc and kaolin

“…Highly crystalline ␣-cordierite phase is normally obtained from solid state [1][2][3][4][5][6][7][8][9][10] and sol-gel methods [11][12][13][14][15][16][17][18] after sintering above 1000 • C, and below 1000 • C through the glass route [19][20][21][22][23][24][25][26][27][28]. However, ␣-cordierite phase synthesized through the glass route requires the mixture of the compound to be fired above its melting temperature prior to being quenched, pulverized, compacted and sintered.…”

Crystal structure of single phase and low sintering temperature of α-cordierite synthesized from talc and kaolin

“…The researches were carried out basically to decrease the crystallization and sintering temperature of ␣-cordierite by using various sintering aids [1,[6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], sol-gel method with various precursors [14,[25][26][27][28][29][30], non-hydrolytic sol-gel route [2] or using very fine particles size [31]. However, there is no report on the ability to synthesize ␣-cordierite below 1000 • C using the methods that are described above.…”