کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1526674 | 995373 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization of RMnO3 (RÂ =Â Sc, Y, Dy-Lu): High-pressure synthesized metastable perovskites and their hexagonal precursor phases
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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
A series of RMnO3 samples with R = Sc, Y, Dy-Lu was synthesized through a two-step route in which first the hexagonal oxides, h-RMnO3, were prepared under normal pressure using an EDTA method and then converted to orthorhombic perovskites, o-RMnO3, through a high-pressure treatment at 5 GPa and 800 °C. Since all the aforementioned members but the R = Sc member were converted to an orthorhombic perovskite phase under the 5-GPa high-pressure condition, an additional sample of InMnO3 of the hexagonal structure was prepared and tested for the high-pressure conversion. The stability limit of the orthorhombic perovskite structure under the 5-GPa high-pressure condition was concluded to be located between InMnO3 and LuMnO3 in terms of the size of the A-site cation constituent, RIII or InIII. The decrease in the size of RIII was found to increase the distortion of o-RMnO3 with a decrease in the MnOMn bond angle from 144.3° for Dy to 140.3° for Lu. All the hexagonal and orthorhombic RMnO3 phases exhibited antiferromagnetic characteristics at low temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 112, Issue 3, 20 December 2008, Pages 1029-1034
Journal: Materials Chemistry and Physics - Volume 112, Issue 3, 20 December 2008, Pages 1029-1034
نویسندگان
K. Uusi-Esko, J. Malm, N. Imamura, H. Yamauchi, M. Karppinen,