20.500.12556/RUL-181380 Synthesis and characterization of a new high-entropy oxide based on rare-earth elements (Dy,Y,Yb,Nd,Pr)O$_{1.5\pm\delta}$ prepared by citrate–nitrate combustion synthesis High-entropy oxides represent a modern class of materials with broad applicability, in which the configurational entropy of multiple equimolar cations stabilises single-phase structures with unique defect chemistry and tunable functional properties. In the proposed work, a novel rare-earth high-entropy oxide with the composition (Dy,Y,Yb,Nd,Pr)O$_{1.5\pm\delta}$ was synthesized via citrate–nitrate combustion synthesis, followed by calcination in the temperature range 600-1100 °C. Thermogravimetry coupled with mass spectrometry revealed multi-stage decomposition and carbon removal, defining the temperatures required for complete oxidation of carbonaceous residues. High-temperature and ambient XRD analyses confirmed the formation of a single-phase cubic oxide with progressive crystallite growth from ∼10 to 40 nm upon calcination. Optical reflectance measurements showed a semiconducting band gap from 2.26 to 2.39 eV and Urbach energies that reflect changes in structural disorder during calcination. SEM/EDS analyses demonstrated the formation of homogeneous nanocrystals, with surface areas up to 31 m$^2$g$^{−1}$. The study provides a detailed description of phase evolution, defect chemistry, and disorder formation in a combustion-derived rare-earth high-entropy oxide with potential applications in the semiconductor industry. high-entropy ceramics combustion synthesis thermal analysis band gap keramika z visoko entropijo zgorevalna sinteza termična analiza pasovna vrzel true false true Angleški jezik Slovenski jezik Članek v reviji 2026-04-03 11:27:09 2026-04-03 11:27:11 2026-04-04 04:47:29 0000-00-00 00:00:00 2026 0 0 11 str. iss. Vol. 2026 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.1 0272-8842 10.1016/j.ceramint.2026.03.405 274021891 RAZ_Skalar_Tina_2026.pdf RAZ_Skalar_Tina_2026.pdf 1 5E374E8F638A8469FCDB587ECA40C1B9 34888a294a0795a81fe35419c960a893816c3530b2733d548940e2cdbad48acb d2a5ba65-2f3f-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=231794 https://www.sciencedirect.com/science/article/pii/S0272884226014793 1 2121423c-2f3f-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=231792 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0