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This study employs a first-principles approach to comprehensively examine the structural, electronic, optical, and magnetic properties of the thermodynamically stable scintillating double perovskite halides A 2 N a T a X 6 ( A = C s , R b ; X = C l , B r , I ). The dynamic stability of these materials were explained based on deduced phonon properties. Our analysis reveals that these compounds exhibit intriguing electronic behavior with spin polarization, demonstrating half-metallicity. In spin-up, the band gap is found to be zero, while in spin-down, it falls within the range of 3 to 4 eV with the incorporation of DFT+U corrections. Notably, the optical properties assessment highlights the exceptional UV and high-energy absorption capabilities of A 2 N a T a I 6 , making it a promising candidate for scintillation applications in particle detection. This research sheds light on the unique and versatile properties of these materials, with implications for various technological and scientific applications. [ABSTRACT FROM AUTHOR]

The electronic, elastic, structural, thermoelectric and optical parameters of Pb-based cubic perovskites P b R E O 3 (R E = C e , N d , G d) were calculated using the WIEN2k Package. The mechanical optimization and structural stabilities were evaluated. The found results are in full agreement with the experimental ones. The obtained elastic results show that these perovskites behave as stable ductile materials, and their higher Y value gives them rigid structures. The P b C e O 3 presents n-type semiconductor while P b R E O 3 (R E = N d , G d) exhibit p-type semi-conductors with gap energies of 2. 60 eV , 1. 02 eV and 1. 55 eV , respectively. The optical properties show that P b R E O 3 (R E = C e , N d , G d) have significant absorption in the visible light region with low reflectivity. The thermoelectric properties present a desired electrical performance at room temperature for all materials. For these generation of materials, the effect of RE on Pb-based cubic perovskite oxides can be exploited in manufacturing of thermoelectric, mechanic and optoelectronic devices. • Physical properties of PbCeO3, PbNdO3 and PbGdO3 were studied. • Structural and elastic properties present a stable behavior of the studied compounds. • The electronic properties indicate the semiconductor behavior of all studied. • Optical properties presents an important absorption coefficient in the visible region. • Thermoelectric properties show the charge carriers responsible of the conduction. [ABSTRACT FROM AUTHOR]

Various physical properties (electronic, optical and thermoelectric) of cubic perovskite oxides Sr X O 3 (X = Sc, Ge, Si) are investigated by using the density functional theory (DFT) within Wien2K code. This code is based on different approximations such as generalized gradient approximation GGA, PBEsol, LDA, WC and the modified Becke–Johnson exchange potentials (mBJ, nmBJ and unmBJ). Structural properties and the optimization have been calculated using PBEsol functional which showed a significant results that are in good agreement with the experimental ones. The results for physical properties such as electronic, thermoelectric and optical are analyzed in detail by using the nmBJ approximation. The obtained results present an opening gap for SrSiO 3 , SrGeO 3 and a metallic behavior for SrScO 3. An average of transmittance which is about 94% to 97% was observed in the range of visible light. The increase of electrical conductivity with temperature confirms the effect of thermal agitation on the concentration of charges carriers using BolzTrap2 Package. Lastly a phonon dispersion was made and show that for X = Ge and Si, the structure is relatively stable while SrScO 3 is dynamically unstable. These results prove the ability that these materials can be exploited in many applications and manufacturing of optoelectronics for Sensors. [ABSTRACT FROM AUTHOR]