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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Hydride Formation in the Intermetallic Compounds CePd3 and CeRh3
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Hydride Formation in the Intermetallic Compounds CePd3 and CeRh3

机译:金属间化合物CePd3和CeRh3中的氢化物形成

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The intermetallic compounds CePd3 and CeRh3 were hydrogenated at hydrogen pressures up to 24 MPa and temperatures up to 540 K, and investigated by X-ray and neutron powder diffraction and X-ray photoelectron spectroscopy (XPS). Both compounds retain their AuCu3 type arrangement upon hydrogen uptake. The cubic, lattice parameters increase from 412.5(1) and 402.57(2) pm in CePd3 and CeRh3, respectively, to 413.5(1) and 406.27(3) pm in the corresponding hydrides. In contrast to the rhodium compound CePd3Hx forms only under high pressure and room temperature and releases hydrogen quickly in air. From neutron powder diffraction on CeRh3D0.84 deuterium atoms were found to Occupy 84.4(8)% of octahedral interstices formed solely by rhodium atom-is, [Rh-6] in a statistical fashion, resulting in a deficient cubic anti-perovskite type structure (space group Pm (3) over barm (No. 221), a = 407.248(7) pm at T = 299(2) K). Rhodium-deuterium (203.62(1) pm) and cerium-deuterium distances (352.69(1) pm) are consistent with typical interatomic distances in other hydrides. XPS measurements reveal mixed valency in CePd3.
机译:金属间化合物CePd3和CeRh3在高达24 MPa的氢气压力和高达540 K的温度下氢化,并通过X射线和中子粉末衍射以及X射线光电子能谱(XPS)进行了研究。两种化合物在吸收氢后都保持其AuCu3型排列。立方晶格参数分别从CePd3和CeRh3中的412.5(1)pm和402.57(2)pm增加到相应氢化物中的413.5(1)和406.27(3)pm。与铑化合物相反,CePd3Hx仅在高压和室温下形成,并在空气中快速释放氢。通过对CeRh3D0.84氘原子的中子粉末衍射发现,以统计方式占据了仅由铑原子-[Rh-6]形成的八面体间隙的84.4(8)%,从而导致立方抗钙钛矿型结构不足(空间组Pm(3)在barm(编号221)上,a = 407.248(7)pm,T = 299(2)K)。铑-氘(203.62(1)pm)和铈-氘的距离(352.69(1)pm)与其他氢化物中的典型原子间距离一致。 XPS测量显示CePd3中的化合价。

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