Influence of atomic order on the enthalpy of formation and bulk modulus of the sigma phase
[CHIM.MATE] Chemical Sciences/Material chemistry
Sigma phase
Enthalpy of formation
enthalpy of formation
[CHIM.MATE]Chemical Sciences/Material chemistry
bulk modulus
atomic order
01 natural sciences
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry
[CHIM.THEO] Chemical Sciences/Theoretical and/or physical chemistry
EMTO-CPA
0103 physical sciences
Atomic order
sigma phase
Bulk modulus
DOI:
10.1016/j.fluid.2017.10.006
Publication Date:
2017-10-12T13:21:20Z
AUTHORS (5)
ABSTRACT
Abstract We have calculated the enthalpy of formation and bulk modulus for 19 typical binary sigma compounds with different atomic order (i.e. atomic constituent distribution or site occupancy preference on inequivalent sites of a crystal structure) based on the experimental site occupancy as well as completely ordered and hypothetically disordered states by using the EMTO-CPA (Exact Muffin-Tin Orbitals - Coherent Potential Approximation) method. The calculation results show that at 0 K the sigma phase in ordered state bears a lower enthalpy of formation and a larger bulk modulus than the ones in less ordered state.
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