کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1491001 992339 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural phase transition in the perovskite-type tantalum oxynitrides, Ca1−xEuxTa(O,N)3
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Structural phase transition in the perovskite-type tantalum oxynitrides, Ca1−xEuxTa(O,N)3
چکیده انگلیسی

Pure Ca1−xEuxTa(O,N)3 were successfully synthesized in the whole range of Ca/Eu compositions by means of ammonia nitridation via a citrate precursor route. As-nitrided products with x < 0.4 were apparently orthorhombic, while those with x ≥ 0.4 crystallized in a cubic structure. The anionic composition was found to be essentially O2N and independent of Eu content (x). The as-nitrided EuTaO2N possessed a cubic perovskite-type structure, while high-temperature post-annealing led to a tetragonal EuTaO2N phase with better crystallinity. The re-nitridation transformed the post-annealed product into the original cubic lattice, which might be an average of the tetragonal micro-domains.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 44, Issue 9, September 2009, Pages 1899–1905
نویسندگان
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