Grain boundaries (GBs) and interfaces in polycrystalline materials are significant research subjects the field of science. Despite a more than 50-year history their study, there still many open questions. The main challenge studying interfacial structures is extreme complexity experimental theoretical observation description. presence phase-like states at grain called complexions requires even ...

This is the first of a series of five papers in which the thermodynamic properties of minerals are interpreted in terms of lattice vibrational spectra. In this paper, measured heat capacities for minerals are examined in terms of the Debye theory of lattice vibrations, and it is demonstrated that heat capacities of silicates show large deviations from the behavior expected from Debye theory. Th...

We have studied the high-pressure behavior of periclase ~MgO! using density functional simulations within the generalized gradient approximation. The static and thermal (P-V-T) equation of state, B1-B2 transition pressure, elastic constants, Grüneisen parameter, and the intrinsic anharmonic parameters were calculated from static and ab initio molecular dynamics simulations. The simulations were...

[1] Room temperature investigations on the shear strength, elastic moduli, elastic anisotropy, and deformation mechanisms of MgO (periclase) are performed in situ up to pressures of 47 GPa using radial X-ray diffraction and the diamond anvil cell. The calculated elastic moduli are in agreement with previous Brillouin spectroscopy studies. The uniaxial stress component in the polycrystalline MgO...

The seismic anisotropy observed in Earth's lowermost mantle (D″ layer) is thought to originate from the lattice-preferred orientation (LPO) of materials induced by plastic deformation. Ferropericlase second most abundant mineral lower mantle, and its LPO deformation may significantly contribute D″ layer. slip system(s) ferropericlase controlling layer still controversial, owing technical diffic...

Besides the good performance of electrofused magnesia-chromite aggregate (EMCA) in ceramic refractories, generation toxic Cr+6 after working conditions is driving its urgent replacement. Aiming at optimizing search towards eco-friendly options, this work applied multiple electron-microscope-based techniques to assess key microstructural features. BSE/EDS imaging coupled with thermodynamic calcu...

Abstract To study the microstructural evolution of polymineralic rocks, we performed deformation experiments on two‐phase aggregates olivine (Ol) + ferropericlase (Per) with periclase fractions ( f Per ) between 0.1 and 0.8. Additionally, single‐phase samples both Ol were deformed under same experimental conditions to facilitate comparison microstructures in materials. Each sample was torsion a...

This research combines technical, environmental, and economic aspects regarding the utilization of Bege Bahia marble waste (BB) in clinker production. Three different eco-friendly clinkers were produced, investigated, compared with one that is commercially available. BB was used to replace 49.2%, 77%, 80.3% limestone by total amount clinker. Two selected produce cement pastes, their impact on c...

Abstract In recent decades, considerable attention has been paid to the catalytic dry reforming of methane obtain syngas. This reaction very important environmental implications due utilization CH 4 and CO 2 , gases that contribute greenhouse effect. The is normally carried out over strong basic catalysts with noble metals. Nickel emerged as an interesting alternative, although it tends deactiv...