کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1331833 | 979017 | 2009 | 7 صفحه PDF | دانلود رایگان |
We describe the preparation, structure determination and magnetic properties of two Ba perovskites containing rare-earth cations at the B-sublattice. Ba3Ln2MoO9 (Ln=Ho3+ and Er3+) were synthesized by ceramic procedures. Joint X-ray (XRPD) and neutron (NPD) powder diffraction refinements were carried out to analyse the crystal structure. At room temperature, both phases are tetragonal, space group I4/mcm, Z=4. Ln and Mo atoms are found to be distributed at random over the octahedral sites of the perovskites. Magnetic measurements at 0.1 T show that both samples are paramagnetic between 3 and 300 K, following a Curie–Weiss law. M vs. H curves show a region of paramagnetic behaviour and above 2.5 T a magnetic saturated system is observed. Finally, the temperature evolution of the NPD patterns of Ba3Ho2MoO9 reveals the absence of long-range magnetic ordering down to 2 K.
Graphical AbstractPreparation, structure and magnetic properties of Ba3Ln2MoO9 (Ln=Ho3+ and Er3+) are descripted. Joint XRPD and NPD refinements confirm a tetragonal I4/mcm structure. Ln and Mo atoms are found to be distributed at random over the octahedral sites of the perovskites.Figure optionsDownload as PowerPoint slide
Journal: Journal of Solid State Chemistry - Volume 182, Issue 6, June 2009, Pages 1492–1498