کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1622514 1516401 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural and magnetic properties of the (Bi2−xPrx)Ru2O7 pyrochlore solid solution (0 ≤ x ≤ 2)
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Structural and magnetic properties of the (Bi2−xPrx)Ru2O7 pyrochlore solid solution (0 ≤ x ≤ 2)
چکیده انگلیسی

We report a detailed study of structural and magnetic properties of the pyrochlore-type (Bi2−xPrx)Ru2O7 series. Eleven compositions with 0 ≤ x ≤ 2 were prepared by solid-state reaction at 1050 °C and found to form a solid solution in the whole range of compositions. Structural refinements from X-ray powder diffraction data by the Rietveld method show that the main variation concerns the ruthenium site. Ru–O distances increase and the Ru–O–Ru angle (bridging corner-sharing Ru–O octahedra) decreases with increasing praseodymium content, in agreement with the metal–semiconductor transition observed previously in this system. Magnetic measurements show that the metallic Pauli paramagnetism of Ru in Bi2Ru2O7 evolves to a magnetism of localized low spin moments coexisting with the magnetism of Pr3+ cations moments. Strong magnetic correlations are present at high Pr content, as illustrated by a Néel temperature of −224 K for Pr2Ru2O7. However no evidence of a magnetic ordering was found, suggesting that the end compound Pr2Ru2O7 of the series might stabilize a spin liquid phase.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 476, Issues 1–2, 12 May 2009, Pages 43–48
نویسندگان
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