Econ. Environ. Geol. 2012; 45(2): 79-88
Published online April 30, 2012
© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY
Correspondence to : Yongjae Lee
The increased brightness and focused X-ray beams now available from laboratory X-ray sources facilitates a variety of powder diffraction experiments not practical using conventional in-house sources. Furthermore, the increased availability of 2-dimensional area detectors, along with implementation of improved software and customized sample environmental cells, makes possible new classes of in-situ and time-resolved diffraction experiments. These include phase transitions under variable pressure- and temperature conditions and ion-exchange reactions. Examples of in-situ and time-resolved studies which are presented here include: (1) time-resolved data to evaluate the kinetics and mechanism of ion exchange in mineral natrolite; (2) in-situ dehydration and thermal expansion behaviors of ion-exchanged natrolite; and (3) observations of the phases forming under controlled hydrostatic pressure conditions in ion-exchanged natrolite. Both the quantity and quality of the in-situ diffraction data are such to allow evaluation of the reaction pathway and Rietveld analysis on selected dataset. These laboratory-based in-situ studies will increase the predictability of the follow-up experiments at more specialized beamlines at the synchrotron.
Keywords in-situ, X-ray diffraction, phase transition, natrolite, sample environmental cell
Econ. Environ. Geol. 2012; 45(2): 79-88
Published online April 30, 2012
Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.
Donghoon Seoung, Yongmoon Lee and Yongjae Lee*
Department of Earth System Sciences, Yonsei University, Seoul, Korea
Correspondence to:
Yongjae Lee
The increased brightness and focused X-ray beams now available from laboratory X-ray sources facilitates a variety of powder diffraction experiments not practical using conventional in-house sources. Furthermore, the increased availability of 2-dimensional area detectors, along with implementation of improved software and customized sample environmental cells, makes possible new classes of in-situ and time-resolved diffraction experiments. These include phase transitions under variable pressure- and temperature conditions and ion-exchange reactions. Examples of in-situ and time-resolved studies which are presented here include: (1) time-resolved data to evaluate the kinetics and mechanism of ion exchange in mineral natrolite; (2) in-situ dehydration and thermal expansion behaviors of ion-exchanged natrolite; and (3) observations of the phases forming under controlled hydrostatic pressure conditions in ion-exchanged natrolite. Both the quantity and quality of the in-situ diffraction data are such to allow evaluation of the reaction pathway and Rietveld analysis on selected dataset. These laboratory-based in-situ studies will increase the predictability of the follow-up experiments at more specialized beamlines at the synchrotron.
Keywords in-situ, X-ray diffraction, phase transition, natrolite, sample environmental cell
Ju Young Park, Sun Young Park, Jiyoung Choi, Sungil Kim, Yuri Kim, Bo Yeon Yi, Kyungbook Lee
Econ. Environ. Geol. 2024; 57(5): 529-537Ha Kim, Seongsik Hong, Chaewon Park, Jihye Oh, Jonguk Kim, Yungoo Song
Econ. Environ. Geol. 2023; 56(2): 115-123Hyunseung Lee, Soojin Lee, Yongmoon Lee
Econ. Environ. Geol. 2023; 56(1): 13-21