Abstract The thermal decomposition of yttrium 2-methylbutyrate (Y(C4H9CO2)3) under argon gas flow has been investigated by means of simultaneous thermogravimetry and differential thermal analysis, FTIR-spectroscopy (solid residue and evolved gas analysis), mass spectrometry, hot-stage optical microscopy and X-ray diffraction with a standard laboratory Cu-tube source as well as with a high-energy synchrotron radiation source. At least one structural transition occurs in the solid state between 100 °C and 160 °C. The decomposition of the Y 2-methylbutyrate salt takes place above 400 °C. A first stage results in the formation of Y2O2CO3 between 400 °C and 490 °C. This decomposition step is accompanied by the release of CO2, a symmetrical ketone (3,5-dimethyl-4-heptanone), as well as probably a terminal alkyne, which could not be unambiguously identified. At higher temperature, Y2O2CO3 is slowly converted to Y2O3 with release of CO2, while some carbonaceous residue is eliminated via combustion. The TG trace reaches the final plateau at about 1200 °C.

中文翻译：

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2-甲基丁酸钇在氩气中的热分解

摘要 采用同步热重法和差热分析法、FTIR 光谱法（固体残留物和逸出气体分析）、质谱法、热分析法研究了 2-甲基丁酸钇 (Y(C4H9CO2)3) 在氩气流下的热分解。舞台光学显微镜和 X 射线衍射与标准实验室铜管源以及高能同步辐射源。至少一种结构转变发生在 100 °C 和 160 °C 之间的固态中。Y 2-甲基丁酸盐的分解发生在 400 °C 以上。第一阶段导致在 400 °C 和 490 °C 之间形成 Y2O2CO3。该分解步骤伴随着 CO2、对称酮（3,5-二甲基-4-庚酮）以及可能的末端炔烃的释放，无法明确识别。在较高温度下，Y2O2CO3 缓慢转化为 Y2O3，并释放出 CO2，同时通过燃烧消除一些含碳残留物。TG 轨迹在大约 1200 °C 时达到最终平台。