کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5447983 | 1511766 | 2017 | 21 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermally induced phase transformations of lepidocrocite-like ferrititanate nanosheets synthesized from a low cost precursor by hydrothermal method
ترجمه فارسی عنوان
تغییرات فازی ناشی از حرارتی از نانوذرات فرتیتیانات مانند لیپیدوکروسیتی مانند سنتز شده از پیش تعیین شده با هیدروترمال
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
چکیده انگلیسی
Thermal stability and phase transformation paths of Lepidocrocite-like layered titanates (LTs-NS) are not well established. This is especially true for the ferrititanate nanosheets, recently synthesized from mineral sands. High-temperature phase transformation paths of three types of lepidocrocite-like layered ferrititanate nanosheets were examined by in situ HT-XRPD and TG analyses. We analyzed sodium-rich (NaLTs-NS), protonated (pLTs-NS), and a nanohybrid (pLTs-o-2C18-NS) nanosheets, the last one composed from the individual ferrititanate host layers and dimethyldioctadecylammonium cations (2C18+). We investigated how the presence of Na+, H+ and 2C18+ influences the thermal behavior of LTs nanosheets. The three materials show different thermal evolution paths. Na-LTs-NS exhibit the highest thermal stability, where the layered structure is preserved to at least 600 °C. Na-LTs-NS transform to freudenbergite (Na2(Ti,Fe)8O16) at 700 °C. Rutile and pseudobrookite form at higher temperatures in Na-rich ferrititanate system and coexist with freudenbergite. Thermal stability of protonated nanosheets is much lower since the layered structure is destroyed under 500 °C. High temperature phases pseudobrookite (Fe2TiO5) and rutile (TiO2) crystallize at â¼700 °C which is in accordance with the stability field for the Fe2O3-TiO2 binary phase diagram rich in TiO2. In the case of pLTs-o-2C18-NS rutile and hematite form at 650 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 197, 15 August 2017, Pages 138-144
Journal: Materials Chemistry and Physics - Volume 197, 15 August 2017, Pages 138-144
نویسندگان
Anja Dosen, Patricia I. Pontón, Bojan A. Marinkovic,