New quaternary R2CoAl4Si2 compounds

IF 3.4 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Solid State Sciences Pub Date : 2024-11-06 DOI:10.1016/j.solidstatesciences.2024.107749

Svitlana Pukas, Kateryna Kravets, Pavlo Demchenko, Nataliya Semuso, Roman Gladyshevskii

{"title":"New quaternary R2CoAl4Si2 compounds","authors":"Svitlana Pukas, Kateryna Kravets, Pavlo Demchenko, Nataliya Semuso, Roman Gladyshevskii","doi":"10.1016/j.solidstatesciences.2024.107749","DOIUrl":null,"url":null,"abstract":"<div><div>Eight new R2CoAl4Si2 silicides (R = Y, Gd-Yb) were synthesized by arc melting, and their crystal structures were studied by X-ray powder diffraction. The compounds were found to adopt the same tetragonal structure type Tb2NiAl4Ge2 (Pearson symbol tI18, space group I4/mmm) and the cell parameters refined to: a = 4.09319 (6), c = 19.3431 (4) Å (R = Y), a = 4.1109 (3), c = 19.425 (2) Å (R = Gd), a = 4.09788 (8), c = 19.3616 (5) Å (R = Tb), a = 4.0850 (1), c = 19.2967 (8) Å (R = Dy), a = 4.07802 (2), c = 19.2575 (2) Å (R = Ho), a = 4.06871 (8), c = 19.2082 (5) Å (R = Er), a = 4.05836 (4), c = 19.1599 (4) Å (R = Tm), and a = 4.06627 (6), c = 4.06627 (6) Å (R = Yb). Isotypic compounds with R = Sm, Lu were not observed under the experimental conditions.</div><div>The structure type Tb2NiAl4Ge2 is a quaternary variant of the prototype Yb3S2F4 ≡ (NiGe2)Tb2Al4. The structure of the R2CoAl4Si2 compounds can be described as a packing of monocapped square antiprisms [SiAl4R5] and cubes [CoAl8]. It can also be considered as formed by two types of layer containing cubes, stacked along the crystallographic direction [001]. One kind of layer is built of cubes of composition Al8, with every second cube centered by a Co atom, while the other kind of layer consists of slightly deformed empty cubes of composition R4Si4.</div></div>","PeriodicalId":432,"journal":{"name":"Solid State Sciences","volume":"158 ","pages":"Article 107749"},"PeriodicalIF":3.4000,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid State Sciences","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1293255824003145","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}

引用次数: 0

Abstract

Eight new R₂CoAl₄Si₂ silicides (R = Y, Gd-Yb) were synthesized by arc melting, and their crystal structures were studied by X-ray powder diffraction. The compounds were found to adopt the same tetragonal structure type Tb₂NiAl₄Ge₂ (Pearson symbol tI18, space group I4/mmm) and the cell parameters refined to: a = 4.09319 (6), c = 19.3431 (4) Å (R = Y), a = 4.1109 (3), c = 19.425 (2) Å (R = Gd), a = 4.09788 (8), c = 19.3616 (5) Å (R = Tb), a = 4.0850 (1), c = 19.2967 (8) Å (R = Dy), a = 4.07802 (2), c = 19.2575 (2) Å (R = Ho), a = 4.06871 (8), c = 19.2082 (5) Å (R = Er), a = 4.05836 (4), c = 19.1599 (4) Å (R = Tm), and a = 4.06627 (6), c = 4.06627 (6) Å (R = Yb). Isotypic compounds with R = Sm, Lu were not observed under the experimental conditions.

The structure type Tb₂NiAl₄Ge₂ is a quaternary variant of the prototype Yb₃S₂F₄ ≡ (NiGe₂)Tb₂Al₄. The structure of the R₂CoAl₄Si₂ compounds can be described as a packing of monocapped square antiprisms [SiAl₄R₅] and cubes [CoAl₈]. It can also be considered as formed by two types of layer containing cubes, stacked along the crystallographic direction [001]. One kind of layer is built of cubes of composition Al₈, with every second cube centered by a Co atom, while the other kind of layer consists of slightly deformed empty cubes of composition R₄Si₄.

Abstract Image

查看原文本刊更多论文

新型 R2CoAl4Si2 季化合物

通过电弧熔融法合成了八种新的 R2CoAl4Si2 硅化物（R = Y，Gd-Yb），并利用 X 射线粉末衍射法研究了它们的晶体结构。发现这些化合物采用相同的四方结构类型 Tb2NiAl4Ge2（皮尔逊符号 tI18，空间群 I4/mmm），晶胞参数细化为：a = 4.09319 (6)，c = 19.3431 (4) Å (R = Y)；a = 4.1109 (3)，c = 19.425 (2) Å (R = Gd)；a = 4.09788 (8)，c = 19.3616 (5) Å (R = Tb)，a = 4.0850 (1)，c = 19.2967 (8) Å (R = Dy)，a = 4.07802 (2)，c = 19.2575 (2) Å (R = Ho)，a = 4.06871 (8)，c = 19.2082 (5) Å (R = Er)，a = 4.05836 (4)，c = 19.1599 (4) Å (R = Tm)，以及 a = 4.06627 (6)，c = 4.06627 (6) Å (R = Yb)。Tb2NiAl4Ge2 结构类型是 Yb3S2F4 ≡ (NiGe2)Tb2Al4 原型的四元变体。R2CoAl4Si2 化合物的结构可以描述为单帽方形反棱柱[SiAl4R5]和立方体[CoAl8]的堆积。也可以认为它是由两种含有立方体的层沿晶体学方向堆叠而成[001]。一种晶层由成分为 Al8 的立方体构成，每第二个立方体都以一个 Co 原子为中心，而另一种晶层则由成分为 R4Si4 的轻微变形空立方体构成。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Solid State Sciences 化学-无机化学与核化学

CiteScore

6.60

自引率

2.90%

发文量

214

审稿时长

27 days

期刊介绍： Solid State Sciences is the journal for researchers from the broad solid state chemistry and physics community. It publishes key articles on all aspects of solid state synthesis, structure-property relationships, theory and functionalities, in relation with experiments. Key topics for stand-alone papers and special issues: -Novel ways of synthesis, inorganic functional materials, including porous and glassy materials, hybrid organic-inorganic compounds and nanomaterials -Physical properties, emphasizing but not limited to the electrical, magnetical and optical features -Materials related to information technology and energy and environmental sciences. The journal publishes feature articles from experts in the field upon invitation. Solid State Sciences - your gateway to energy-related materials.