Papers by Keyword: Spodumene

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Authors: G. Morrison, C.M. Barker, K.M. Kennedy, Alan V. Chadwick
Authors: Pannipa Noithong, Panee Pakkong, Kittisakchai Naemchanthara
Abstract: Study on the electron beam irradiation color change induction of spodumene (LiAlSi2O6) samples, which color exhibit green, pink and colorless. Characteristic the electron-beam irradiation dose were selected 30,000 kGy, 40,000 kGy and 50,000 kGy. The color and fading of spodumene samples were analyzed by UV-VIS spectrophotometer , crystal structure were determined by X-ray diffraction (XRD) spectrometer, free radical species of impurities were determined by Electron Spin Resonance (ESR) spectrometer before and after irradiation. The results revealed the color of spodumene samples changed after irradiation, from green spodumene became a little darker color, pink spodumene became green color, colorless spodumene became pink to purple color the results of the color analysis and fading displayed on the CIE L* a* b* color system, color change spodumene samples were determined by values changed of a* and b*. Color fade of spodumene were determined by values changed of L*. The results of all samples crystal structure analysis were shown on the XRD patterns of the JCPDS No. 89-6662 (Spodumene) with monoclinic structure. The radical analysis results of impurity elements, green and pink only appear the ESR pattern of manganese (Mn2+), and chromium (Cr3+), respectively. It can be conclusion that intensity of color change depend on the irradiation dose and impurity elements in spodumene samples.
Authors: F.M.A. Margaça, M. Moreira, José M. Teixeira, Rui F. Silva, I.M. Miranda Salvado
Authors: Zi Fan Xiao, Jin Shu Cheng, Jun Xie
Abstract: A glass-ceramic belonging to the CaO-Al2O3-SiO2 (CAS) system with different composition of spodumene and doping the Li2O with amount between 0~2.5 % (mass fraction) were prepared by onestage heat treatment, under sintering and crystallization temperature at 1120 °C for two hours. In this paper, differential thermal analysis, X-ray diffraction, scanning electron microscopy, energy dispersive spectrometry and bending strength test were employed to investigate the microstructure and properties of all samples. β-wollastonite crystals were identified as the major crystalline phases, and increasing Li2O was found to be benefit for the crystallization and tiny crystalline phases remelting, resulting in the content of major crystalline phases increased first and then decreased with increasing the expense of spodumene. Meanwhile, the crystal size can be positively related with the content of Li2O. The preferable admixed dosage of spodumene can be obtained, besides the strength of glass-ceramics can be more than 90 MPa.
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