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اکسیدهای اصلی آهن عبارتند ازآهن دو ظرفیتی (FeO)، آهن سه ظرفیتی (Fe2O3) و آهن دو و سه ظرفیتی (Fe3O4). اکسید آهن سه ظرفیتی اگر در طبیعت به طور غیر مصنوع یافت شود با نام هماتیت نیز خوانده میشود. هر کدام از این اکسیدها خواص و ویژگیهای متفاوت دارند، به عنوان مثال هماتیت خواص مغناطیسی ضعیف اما مگنتیت خواص مغناطیسی شدیدی دارد. در محیط شهری و در طول روز ...
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