A single-phase material based on the complex oxide Ca₂Fe₂O₅ doped with bismuth was synthesized by glycine-nitrate combustion. Characterization by x-ray diffractometry, helium pycnometry, scanning electron microscope, and elemental analysis showed that the material was isostructural to brownmillerite. The optimum temperature for the synthesis of the material was about 650°C and the material had thermal stability over a wide temperature range according to results of complex thermal analysis together with mass spectrometry. The sintering temperature and thermal expansion coefficient of the material were determined using a dilatometry method.

中文翻译：

---

CaO–Bi 2 O 3 –Fe 2 O 3系棕褐色结构的氧化物基材料的合成

通过甘氨酸硝酸盐燃烧合成了基于铋的复合氧化物Ca ₂ Fe ₂ O ₅的单相材料。通过X射线衍射法，氦比重瓶法，扫描电子显微镜和元素分析进行​​表征，表明该材料是同等结构的褐煤。根据复杂的热分析和质谱分析的结果，合成材料的最佳温度约为650°C，并且该材料在较宽的温度范围内具有热稳定性。使用膨胀法确定材料的烧结温度和热膨胀系数。