Physical and chemical properties of solid solutions based on lanthanum indate doped by Nd{3+}, Cr{3+}, Mn{3+} ions

Abstract

La[1–x] Nd[x] InO[3](x = 0.007; 0.02; 0.05); La[0.95]Nd[0.05]In[1–y] M[y]O[3] (M – Cr{3+}, Mn{3+}; y = 0.005), LaIn[1–y]M[y]O[3] ( M – Cr{3+}, Mn{3+}; y = 0.01)solid solutions were obtained by solid-phase route. Their crystal structure, FT-IR spectra, thermal expansion were investigated. Additionally for named solid solutions complex thermal analysis was carried out. It was found that all samples were single-phased and had the structure of orthorhombically distorted perovskite and the lattice parameters vary slightly due to the small content of doping ions. There were absorption bands of La(Nd)–O and In(Cr, Mn)–O stretching vibrations on the FT-IR spectra. The frequencies and intensities of the absorption bands were simi-lar for obtained solid solutions. There were no anomalies caused by phase transitions at temperature de-pendences of elongation. The curves obtained by differential scanning calorimetry had no thermal effects. Total weight loss in the temperature range of 300–1,265 K did not exceed 0.14 wt %. These re-sults indicate that the solid solutions based on LaInO 3 are thermally stable and have a linear coefficient of thermal expansion no greater than (8.3–8.4) · 10{–6} K{–1}. .