کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7921244 | 1511747 | 2018 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Peculiarities in the formation of spinels with the composition Mn-Al = 1:1 in oxidizing, inert or reducing media
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The study revealed peculiarities in the formation of mixed oxides with the Mn3-xAlxO4 spinel structure that were obtained from initial simple oxides β-Mn3O4 and γ-Al2O3 by calcination in various media at 600-1200â¯Â°C. The phase composition of the samples treated in air, argon or hydrogen was investigated using ex situ and in situ X-ray diffraction. It was shown that the occurrence of phase transformations depends on the treatment conditions and is related to the charge state of manganese cations. A scheme of the structural transformations induced by temperature and medium was proposed. The formation temperature of spinel was found to decreases from 950 to 600â¯Â°C when the oxidizing medium is replaced by the reducing one. Mn3-xAlxO4 spinel (xâ¯â¼â¯1.5) was produced in air at temperatures above 1050â¯Â°C or in an inert medium at 800-1200â¯Â°C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 216, 1 September 2018, Pages 37-41
Journal: Materials Chemistry and Physics - Volume 216, 1 September 2018, Pages 37-41
نویسندگان
Olga A. Bulavchenko, Tatyana N. Afonasenko, Pavel G. Tsyrul'nikov, Svetlana V. Cherepanova, Sergey V. Tsybulya,