Genesis of nanocrystalline Ho2O3 via thermal decomposition of holmium acetate: Structure evolution and electrical conductivity properties
来源期刊：JOURNAL OF RARE EARTHS2019年第2期
论文作者：Bahaa M.Abu-Zied Abdullah M.Asiri
文章页码：185 - 192
摘 要：This study focuses on the preparation of nanostructured holmium oxide via the decomposition of holmium acetate precursor utilizing the non-isothermal strategy. Thermogravimetric analysis（TGA） was used to follow up the various thermal events involved in the decomposition process. Dehydration completes approximately at 150℃, which is followed by the decomposition of the anhydrous acetate leading to the formation of holmium oxide. Based on the TGA results the acetate precursor was heated non-isothermally at the temperature range of 150 e700℃. The obtained solids were characterized using powder X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS）, Fourier transform infrared spectroscopy（FT-IR）, field-emission scanning electron microscopy（FE-SEM） and transmission electron microscopy（TEM）. It is found that nanocrystalline Ho2 O3 starts to form at 500℃ and presents the only phase detected at the 500 e700℃ range. The electrical conductivity of the solids that form at the temperature range of 300 e700℃ was investigated. The obtained values were correlated with the observed structural modifications accompanying the heat treatment. The electrical conductivity of the Ho2 O3 samples prepared at 500, 600 and 700℃ reaches the values of 1.92 × 10-7, 1.61 × 10-7 and 8.33 × 10-8 Ω-1cm-1 at a measuring temperature of 500℃, respectively. These values are potentially advantageous for high-resistivity devices.
Bahaa M.Abu-Zied1,2,3，Abdullah M.Asiri1,2
1. Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University2. Chemistry Department, Faculty of Science, King Abdulaziz University3. Chemistry Department, Faculty of Science, Assiut University
摘 要：This study focuses on the preparation of nanostructured holmium oxide via the decomposition of holmium acetate precursor utilizing the non-isothermal strategy. Thermogravimetric analysis（TGA） was used to follow up the various thermal events involved in the decomposition process. Dehydration completes approximately at 150℃, which is followed by the decomposition of the anhydrous acetate leading to the formation of holmium oxide. Based on the TGA results the acetate precursor was heated non-isothermally at the temperature range of 150 e700℃. The obtained solids were characterized using powder X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS）, Fourier transform infrared spectroscopy（FT-IR）, field-emission scanning electron microscopy（FE-SEM） and transmission electron microscopy（TEM）. It is found that nanocrystalline Ho2 O3 starts to form at 500℃ and presents the only phase detected at the 500 e700℃ range. The electrical conductivity of the solids that form at the temperature range of 300 e700℃ was investigated. The obtained values were correlated with the observed structural modifications accompanying the heat treatment. The electrical conductivity of the Ho2 O3 samples prepared at 500, 600 and 700℃ reaches the values of 1.92 × 10-7, 1.61 × 10-7 and 8.33 × 10-8 Ω-1cm-1 at a measuring temperature of 500℃, respectively. These values are potentially advantageous for high-resistivity devices.
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