کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10640024 | 995865 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure evolution and electric properties with addition amounts of dysprosium (DyO1.5) in (BaCa)(TiZr)O3 ceramics
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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
In this study, the effects of various amounts of added DyO1.5 on the substitution mechanism for the (BaCa)(TiZr)O3 (BCTZ) ceramic sintered in a reduction atmosphere were investigated using X-ray diffractometer (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS).The Dy3+ ion occupation sites depended on the A/B ratio, whereas sites for the Ca2+ ions were affected by the DyO1.5 added amount and A/B ratio. For the specimens with A/B ratios below 1, Dy3+ ions mainly occupied the A-sites, which expelled some Ca2+ ions to occupy B-sites, based on XPS spectra and lattice parameter results. The Dy3+ ions occupied A-sites acting as donor, which resulted in a decrease in resistivity. For the samples containing 0.01Â mol% DyO1.5, the Dy2Ti2O7 phase was observed and the resistivity increased rapidly due to the incorporation of Dy3+ ions into B-sites at A/B ratios below 1. As the added DyO1.5 increased to 0.015Â mol%, a certain number of Ca2+ ions were forced to shift from B-sites to A-sites, as suggested by XPS spectra and lattice parameter results, which resulted in a decrease in resistivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 123, Issue 1, 15 November 2005, Pages 69-73
Journal: Materials Science and Engineering: B - Volume 123, Issue 1, 15 November 2005, Pages 69-73
نویسندگان
Hsing-I Hsiang, Ga-Pon Lai,