Dopant incited alterations in structural, morphological, optical, and dielectric properties of Er-doped LaCrO3

Synthesis and Optical Properties of Potassium‐Based Wide‐Bandgap Mixed–Halide Perovskite KPbF2Cl Nanorods

“…To determine the bandgap (E g ) of the system, a Tauc plot (Figure 7) is made by using αhγ = A(hγ À E g ) n , where α is the absorption coefficient, h is the Planck's constant, γ is the frequency of the incident photons, A is an energyindependent proportionality constant, and the exponent n denotes the type of electronic transition between the conduction and valence bands, such as n = 1/2, 2, 3, and 3/2 for direct allowed, indirect allowed, indirect forbidden, and direct forbidden transition, respectively. [38][39][40][41] Since an indirect bandgap is found in KPbF 2 Cl from our calculations, here n = 2 is considered for the Tauc plot (see inset of Figure 7). The intercept of the line along the slope on the hγ axis represents E g with (αhγ) 1/2 equal to zero, providing a bandgap of 4.04 eV.…”

Facile Preparation, Microstructure and Dielectric Properties of La(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 Perovskite High-Entropy Ceramics

“…The dielectric loss shows a different increase trend with the increase in test temperature. This is due to the presence of many point defects (such as vacancies, substituted atoms, and interstitial atoms) in multielement, high-entropy solid solutions that can act as polarization centers and as local stresses caused by lattice disorder that can suppress dipole reorientation under alternating electric fields, thereby increasing the dielectric loss in the material [54][55][56][57]. When the sintering temperature is further increased to 1600 • C, the dielectric constant of the samples is significantly lower than those of high-entropy ceramics sintered at 1500 • C and 1550 • C at the same test temperature, which may be related to the jumping of oxygen vacancies due to the volatilization of elements, such as Cr and Co in the second phase of the sample.…”

(Ca0.25La0.5Dy0.25)CrO3 Ceramic Fiber@Biomass-Derived Carbon Aerogel with Enhanced Solute Transport Channels for Highly Efficient Solar Interface Evaporation

“…2 )CrO 3 exhibited the highest light absorption efficiency, suggesting that Dy doping increased the light absorbance of the lanthanum calcium chromate. Doping with Dy played pivotal roles[45,[48][49][50][51]: (1) Doping with Dy increased the free carrier concentration in (Ca x La 1−x )CrO 3 , which significantly increased the free carrier absorption coefficient; (2) introduction of the dopant atoms distorted the lattice structure, leading to reduced symmetry and increased dipole moments as well as disruption in the periodicities of the lattice vibrations, thereby strengthening the vibration absorption capacities of the materials; (3) the presence of charged impurities also contributed to the absorption of all lattice frequencies, resulting in higher surface absorption coefficients and optical absorbances; and (4) the impurities inhibited grain growth and decreased or increased the densities of the crystal particles, thus reducing the scattering coefficients and increasing the overall absorbances of the materials. Therefore, further investigations were conducted on samples doped with different amounts of Dy to explore their light absorbances, which are depicted in Figure3b.…”