First-principle insight into the structural, electronic, elastic and optical properties of Cs-based double perovskites Cs2XCrCl6 (X = K, Na)

Jehan Y. Al-Humaidi; Abd Ullah; Naimat Ullah Khan; Javed Iqbal; Sajid Khan; Ali Algahtani; Vineet Tirth; Tawfiq Al-Mughanam; Moamen S. Refat; Abid Zaman

doi:10.1039/D3RA03706A

First-principle insight into the structural, electronic, elastic and optical properties of Cs-based double perovskites Cs₂XCrCl₆ (X = K, Na)

Jehan Y. Al-Humaidi,

^a Abd Ullah,*^b Naimat Ullah Khan,^c Javed Iqbal,^d Sajid Khan,^e Ali Algahtani,^fg Vineet Tirth,

^fg Tawfiq Al-Mughanam,^h Moamen S. Refatⁱ and Abid Zaman

*^j

Author affiliations

* Corresponding authors

^a Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. BOX 84428, Riyadh 11671, Saudi Arabia

^b Department of Physics, Government Post Graduate College, Karak, Pakistan
E-mail: ktkshoraim@gmail.com

^c Department of Physics, University of Science and Technology, Bannu, Pakistan

^d Department of Physics, Gomal University, DI Khan, KP, Pakistan

^e Department of Physics, Kohat University of Science and Technology, Kohat 26000, Pakistan

^f Mechanical Engineering Department, College of Engineering, King Khalid University, Abha 61421, Asir, Kingdom of Saudi Arabia

^g Research Center for Advanced Materials Science (RCAMS), King Khalid University, Guraiger, P.O. Box 9004, Abha-61413, Asir, Kingdom of Saudi Arabia

^h Department of Mechanical Engineering, College of Engineering, King Faisal University, P. O. Box 380, Al-Ahsa 31982, Kingdom of Saudi Arabia

ⁱ Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia

^j Department of Physics, Riphah International University, Islamabad 44000, Pakistan
E-mail: zaman.abid87@gmail.com

Abstract

This study communicates the theoretical investigations on the cubic double perovskite compounds Cs₂XCrCl₆ (X = K or Na). Density functional theory (DFT) calculations were carried out using the TB-mBJ approximation. These compounds were found to be stable in the cubic perovskite structure having lattice constants in the range of 10.58–10.20. The stability of the investigated materials was assessed by the Gold-Schmidt tolerance method, which resulted in the tolerance factor values of 0.891 and 0.951 for Cs₂KCrCl₆ and Cs₂NaCrCl₆, respectively. The calculated values of the elastic constants C₁₁, C₁₂, and C₄₄ of the cubic compounds studied by our research team confirm the elastic stability. The values of the formation energies were also calculated for both the compounds and were found in the range from −2.1 to −2.3. The electronic behavior of the presently investigated materials was examined by inspecting their band structures and the density of states. It was observed that both the materials have half-metallic nature. To check the suitability of the studied compounds in optical applications, we determined the real and imaginary parts of their respective dielectric functions, absorption coefficients, optical conductivities, refractive index, and reflectivity as a function of a wide range of incident photon energies up to 40 eV.

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First-principle insight into the structural, electronic, elastic and optical properties of Cs-based double perovskites Cs₂XCrCl₆ (X = K, Na)

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First-principle insight into the structural, electronic, elastic and optical properties of Cs-based double perovskites Cs₂XCrCl₆ (X = K, Na)

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