共沉淀
热分解
无定形固体
尖晶石
材料科学
循环伏安法
氢氧化物
非阻塞I/O
分析化学(期刊)
结晶
核化学
结晶学
热重分析
无机化学
热分析
化学
电化学
冶金
热的
物理化学
物理
气象学
生物化学
催化作用
有机化学
色谱法
电极
作者
František Kovanda,Tomáš Matys Grygar,Vı́t Dorničák
标识
DOI:10.1016/s1293-2558(03)00129-8
摘要
Thermal behaviour of the Ni–Mn layered double hydroxide (LDH) with Ni/Mn molar ratio equal to 2 prepared by coprecipitation was studied in temperature range 200–1100 °C by thermal analysis (TG/DTA/EGA), powder X-ray diffraction (XRD), infrared spectroscopy and voltammetry of microparticles. A loss of interlayer water (dehydration) and sample decomposition accompanied by H2O and CO2 evolution were observed at 175 and 265 °C, respectively. Thermal decomposition of Ni–Mn LDH resulted in formation of a predominantly amorphous mixture of oxides. A relatively high content of amorphous part was observed in samples heated at 200–500 °C. The onset of Ni6MnO8 crystallization was detected by XRD in samples heated at 300 °C. Together with Ni6MnO8, NiMnO3 was detected by XRD in samples heated at 500 °C. According to the voltammetry, the further reconstruction of oxides took place above 600 °C. NiMnO3 and Ni6MnO8 were converted to spinel (Ni,Mn)3O4 occurring together with NiO. These oxides were observed in diffraction patterns of samples heated at high temperatures (800–1100 °C).
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