Thermal Expansion and Luminescent Properties of Triorthogermanates CaLa2-xEuxGe3O10(x= 0.0–0.6)

Solid solutions CaLa2-xEuxGe3O10(x= 0.0–0.6, Δx= 0.1) have been synthesized for the first time. The compounds are isostructural to CaLa2Ge3O10, they crystallize in the monoclinic system, space group P21/c, Z= 4. The low-temperature X-ray diffraction studies have revealed the strain anisotropy of germanate CaLa2Ge3O10crystal lattice in the temperature range 80–298 K, and the linear thermal expansion coefficients have been calculated. The optical properties of the activated phases have been studied, and the influence of the dopant concentration and the excitation wavelength on the luminescence characteristics of the synthesized compounds has been established.