Sr-doped lanthanum manganite La_0.95Sr_0.05MnO_3+δ powder was obtained by sol-gel method. The effect of heating behavior and the effect of interstitial oxygen on structural properties of the LSMO ceramics were studied by XRD, including high-temperature in situ measurements (150–650⁰С). The as prepared powder is single-phase and has a rhombohedral structure (R-3c space group). In situ XRD results showed that heating under vacuum does not lead to a structure change; which remains rhombohedral. However, with an increase of temperature, the lattice parameters increase, reflecting a decrease of interstitial oxygen fraction. In addition, rhombohedral angle α decreases, which indicates that the lattice tends to cubic. Comparison of the studied sample with the La_0.95Sr_0.05MnO₃ annealed in vacuum under special conditions has been carried out. Thermal stability of the material under heating and vacuum, which did not lead to the expected phase transition, was revealed. The necessary conditions for obtaining oxygen stoichiometry are given in work.

Sr掺杂的锰酸镧La _{0 . 95}锶_{0 . 05} MnO _3+δ粉体采用溶胶-凝胶法得到。通过XRD进行了研究加热行为和间隙氧对LSMO陶瓷的结构特性的影响的效果，包括高温原位测量（150-650 ⁰ С）。所制备的粉末是单相的并且具有菱面体结构（R-3c空间群）。就地XRD结果表明真空加热不会导致结构变化；仍然是菱形。然而，随着温度的升高，晶格参数增加，反映了间隙氧分数的减少。此外，菱形角α减小，表明晶格趋于立方。研究样品与 La _{0 的比较。95}锶_{0 . 05} MnO ₃在特殊条件下进行了真空退火。揭示了材料在加热和真空下的热稳定性，这不会导致预期的相变。工作中给出了获得氧化学计量的必要条件。