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A new superconductor (Na0.25K0.45)Ba3Bi4O12, having an A-site-ordered doubleperovskite structure, with a maximum Tc ~ 27 K has very recently beendiscovered through hydrothermal synthesis at 593 K. The structural, elastic,electronic, and thermal properties of the new synthesized compound have beeninvestigated theoretically. Here we have employed the pseudo-potentialplane-wave (PP-PW) approach based on the density functional (DFT) theory,within the generalized gradient approximation (GGA). The elastic constants(Cij), Pugh`s ratio, Cauchy`s pressure and other elastic parameters are derivedand analyzed using energy strain method for the first time. We have discussedthe bonding nature in the light of the electronic valence charge density. Bothelectron and hole-like Fermi surfaces are present in the compound under studywhich indicate the multiple-band nature of (Na0.25K0.45)Ba3Bi4O12. The compoundis indicated to be a strongly coupled superconductor which is based on theestimated e-ph coupling constant. The thermodynamic properties such as bulkmodulus, Debye temperature, heat capacities and volume thermal expansioncoefficient at elevated temperature and pressure are calculated and analyzedfor the first time by using quasi-harmonic model.  Key words: double perovskite, superconductor, elastic properties, electronicproperties, thermal properties

New Superconductor (Na0.25K0.45) Ba3Bi4O12: A First-principles Study