Structure, refractive and electronic properties of K2SO4:Cu2+ (3%) crystals

Potassium Sulfate: A New Candidate to Explore Non-Photochemical Laser-Induced Nucleation Mechanisms

“…The hypothesis that the occurrence of an OKE would be possible provided pre-nucleation clusters exhibited a structure similar to the final crystals (indeed, such an orthorhombic structure should exhibit birefringence) was not confirmed by the results shown in Table 2. Indeed, values from the literature [36] revealed very weak birefringence, indicating that there is no strong polarization axis in the crystalline structure. As a consequence, it was confirmed that there was no evidence of OKE occurring during our experiments.…”

Концентраційні Залежності Діелектричних Параметрів Домішкових Кристалів K2SO4

“…The study of the refractive index dispersion 𝑛 𝑖 (𝜆) of PSCs doped to Cu 2+ ionic concentrations of 1.7% and 3.0% showed that it is normal in the spectral interval of 300-700 nm and drastically increases if approaching the absorption edge [17,19]. The introduction of the admixture of Cu 2+ ions leads to a reduction of the refractive indices 𝑛 𝑖 for the three crystallographic directions in the crystal with a maximum change of about 2.5 × 10 −2 (Fig.…”

“…The influence of copper impurity with various concentrations on the optical parameters (the refractive indices and the birefringence) of PSCs was analyzed in works [16][17][18][19]. It was found that the introduction of impurities leads to the reduction of the absolute values of refractive indices but does not affect the character of their dispersion.…”

“…The structure of PSCs with a copper impurity concentration of 3% was studied by means of X-ray powder diffraction. It was found that this structure can be considered as a result of multiple (two potassium atoms per copper atom) heterovalent substitution of two K + ions in the structure by the Cu 2+ ion [17].…”

A comparable study of the optical spectra and EPR parameters for 3d1‐ and 3d9‐doped MgNH4PO4·6H2O

“…[1][2][3] On the other hand, optical absorption studies can provide the energy level ordering as well as the site symmetry of the TM ions. [4][5][6] Thus, EPR and optical spectrum technique are two powerful tools for studying point symmetry and dynamic properties of the TM ions in the host crystals. Among these TM ions, VO 2+ (3d 1 ) and Cu 2+ (3d 9 ) are the two complementary states with much advantages as probes in studying defect structures and properties in doped materials.…”