Hydride ion as a two-electron donor in a nanoporous crystalline semiconductor 12CaO.7Al(sub 2)O(sub 3)

Article Abstract:

The 12CaO.7Al(sub 2)O(sub 3) (C12A7) crystal with a nanoporous lattice framework exhibits high electrical conductivity with activation energy of approximately 1.5 eV when equilibrated in a hydrogen atmosphere above approximately 800 degree Celsius. The study reveals that the H(super -)ion in C12A7 acts as a two-electron donor through conversion of H(super -) to H(super +).

Lime, Lime Manufacturing, Aluminum Oxide, Electron donor-acceptor complexes, Calcium oxides, Structure, Atomic properties, Hydrides

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Formation of oxygen radicals in 12CaO.7Al2O3: Instability of extraframework oxide ions and uptake of oxygen gas

Article Abstract:

The examination of thermodynamics and kinetics of oxygen radical formation in cages of a nanoporous crystal, 12CaO.7Al2O3 is done during isothermal annealing in a dry oxygen atmosphere. Evaluating the radical formation enthalpy and entropy helps to determine the temperature and oxygen partial pressure dependences of equilibrium oxygen radical concentration.

Analysis, Oxides, Chemistry, Physical and theoretical, Physical chemistry, Active oxygen

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Thermodynamics and kinetics of hydroxide ion formation in 12CaO.7Al2O3

Article Abstract:

The thermodynamics and kinetics of hydroxide (OH-) ionas that formed in cages of 12CaCo/7Al2O3 (C12A7) with nanoporous structures is examined. Diffusion coefficients of species relevant to the hydration process are determined and it is demonstrated that inward diffusion of OH- ions is the rate-determining process.

Science & research, Calcium & Compounds, Aluminum Compounds, Research, Thermodynamics, Hydroxides, Calcium compounds, Chemical properties

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