Youn Joong Kim

TL;DR: The phase transformation from kaolinite to mullite was examined with new electron diffraction data obtained using an energy-filtering transmission electron microscope as mentioned in this paper, and the spinel-type and mullite phases were suggested to be Al-rich, but to progressively gain Si in their structures at higher temperatures.

TL;DR: In this paper, a fine-grained β-Ca2SiO4 containing small amounts of sodium was fabricated as an analogue to tetragonal zirconia polycrystals (TZP) in order to study the stress-induced β→γ transformation.

TL;DR: In this paper, a periodicity of 14 A is recognized as a typical modulation period in metakaolinite and different types of modulations, with periods in the range from ∼1.4d001 (9.47 A) to 2.89 A, form along the c*-axis.

TL;DR: In this paper, the effects of annealing temperature/time, initial particle size, chemical dopants, and shear stress on the conversion of protoenstatite to clinoenstatite (CE) on the powder have been studied.

TL;DR: In this article, changes in 29 Si MAS NMR Spectra of synthetic tridymite from room temperature to 504°C are consistent with the structural phase transitions previously observed by x-ray diffraction and by oatical and calorimetric methods.