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
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Peculiarities in the formation of spinels with the composition Mn-Al = 1:1 in oxidizing, inert or reducing media
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 600-1200 °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 600 °C when the oxidizing medium is replaced by the reducing one. Mn3-xAlxO4 spinel (x ∼ 1.5) was produced in air at temperatures above 1050 °C or in an inert medium at 800-1200 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 216, 1 September 2018, Pages 37-41
نویسندگان
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