Abstract
It is demonstrated that quasielastic neutron scattering is a novel and effective method to analyse atomic scale hydrogen transport processes occurring within a mineral crystal lattice. The method was previously characterized as sensitive for analysing the transport frequency and distance of highly diffusive hydrogen atoms or water molecules in condensed matter. Here are shown the results of its application to analyse the transport of much slower hydrogen atoms which are bonded into a crystal lattice as hydroxyls. Two types of hydrogen transport process were observed in brucite, Mg(OH)2: a jump within a single two-dimensional layer of the hydrogen lattice and a jump into the next nearest layer of it. These transport processes observed within the prototypical structure of brucite have direct implications for hydrogen transport phenomena occurring within various types of oxides and minerals having layered structures.
Highlights
Atomic scale hydrogen transport processes occurring within the crystal lattices of oxides and minerals are important factors controlling the kinetic behaviour of their hydration and dehydration reactions, and affecting the physical properties of the reaction products
1566 Takuo Okuchi et al quasielastic neutron scattering (QENS) to analyse hydrogen transport elastic component of static hydrogen and the broad quasie-. To induce such a QENS effect within a well ordered cryslastic component of mobile hydrogen were detected simulta- talline lattice, hydrogen is chemically bonded to its crystalneously
It has been demonstrated that QENS analysis of hydrogen in the crystal structures of minerals is uniquely effective in elucidating the frequency and geometry of its transport processes
Summary
Atomic scale hydrogen transport processes occurring within the crystal lattices of oxides and minerals are important factors controlling the kinetic behaviour of their hydration and dehydration reactions, and affecting the physical properties of the reaction products. The consequences of the hydrogen transport processes in brucite have been extensively studied using electron microscopy, and significant evidence of hydrogen transport has been observed within the crystal lattice, such as lamellar dehydroxylation and rehydroxylation textures (Anderson & Horlock, 1962; McKelvy et al, 2001; Gomez-Villalba et al, 2016; Pimminger et al, 2016). Controlling such textures is essential for the industrial applications of the oxide produced after calcination of brucite (Shand, 2006; Gomez-Villalba et al, 2017). The hydrogen transport processes in brucite are considered an important subject for in-depth analysis
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
