Cluster Formation in the Superconducting Complex Intermetallic Compound Be₂₁Pt₅

Abstract

GeneralThe SCTE 2018 will follow a series of conferences, dating back more than 50 years, with recent meetings in Annecy, France, (2010), Lisboa, Portugal (2012), Genova, Italy, (2014) and Zaragossa, Spain (2016). The SCTE has always been a forum, where new ideas and discoveries -related to the solid state chemistry and solid state physics of d-and f-element compounds -are presented and discussed.The conference will deal with the structure, crystal chemistry, chemical bonding, and magnetic and electronic transport properties of different classes of intermetallic compounds. The field of hydrides, borides, carbides, silicides and homologues, pnictides, as well as chalcogenides, oxides and halides (especially those of low oxidation state exhibiting metal or semimetal properties) will also be covered.Fundamental and applied research in the areas of solid state chemistry, physics and materials science of compounds containing d-and f-elements will be included. Conference SiteThe conference will be held in the Institute building "Freihaus" of the Technische Universität Wien, using the lecture rooms V and VI. The poster session will also be held in the "Freihaus", Wiedner Hauptstrasse 8-10, 1040 Wien (see the campus map). Technische Universität Wien is located in the city center of Vienna, thus conveniently accessible by the Vienna public transport system. The nearest station to the conference site is "Karlsplatz", to where the underground-lines U1, U2 and U4 are bound. Additionally, the tramway lines 62, 65 as well as 1, 2, D, J, Bus 4 and "Badner Bahn" are nearby. Parking slots for private cars are available in a public park house within the conference building (about A C 90.-/week and A C 4.-/hour). CurrencyThe offcial currency in Austria is the EURO (A C). Foreign currencies can be exchanged in Euro in all banks. The airport and most railway stations have exchange desks and money is available in numerous cash dispensers, prepared for major international cards. Hotels, restaurants, and many shops and travel agencies accept credit cards.iii Language The conference language is English. The language of Austria is German. Conference FeesEarly bird rate:A C 390. • Admission to all technical sessions• Conference material, including the book of abstracts• One printed version of the conference proceedings (students and retirees will not receive the printed versions of the conference proceedings)• Daily coffee breaks• Welcome reception on Sunday, March 25, 2018• Conference dinner on Wednesday, March 28, 2018Accompanying person's conference fees include:• Welcome reception on Sunday, March 25, 2018• Conference dinner on Wednesday, March 28, 2018• Daily coffee breaks• Two guided tours in Vienna Note:• All participants must register with full remittance• Payment after March 15, 2018 is only possible at the conference site (in cash, Euros). RegistrationOn-site registration at the conference will open on Sunday, March 25, 2018 at 15:00 . All conference participants, including speakers, must register at the conference and will re...

Atomic Charges and Chemical Bonding in Y-Ga Compounds

“…This finding indicates the increase in the covalency of the interaction Y-Ga in the binary compounds. Similar behavior was found recently e.g., for Be 21 Pt 5 [10] and CdSb [40]. The QTAIM effective charges of yttrium atoms drop towards +1 (Table 1).…”

Interplay of Atomic Interactions in the Intermetallic Semiconductor Be5Pt

“…The basins of attractors,centred at ( 3 = 4 , 3 = 4 , 3 = 4 )and ( 1 = 2 , 1 = 2 , 1 = 2 ), have common surfaces with 8a nd 14 atomic-core basins.H aving populations of 5.45 and 5.00 electrons,r espectively,t hey represent multi-atomic cluster bonds resulting from the low valence-electron concentration, similar to the ones discovered recently in Be 21 Pt 5 .F rom the intersection analysis,t he contribution of Be1 to the cluster bond pinned at ( 1 = 2 , 1 = 2 , 1 = 2 )i s quite small (0.08 electrons,T able S4), so this cluster bond is considered as ten-atomic (10a) instead of the 14-atomic one, as it was found for Be 21 Pt 5 . [28] Thebasin of the cluster bond at ( 3 = 4 , 3 = 4 , 3 = 4 )d oes not reveal any contributions from the six neighbouring Be1 atoms,t hus the interaction is an eightatomic (8a) one.T he cluster bonds in Be 5 Pt interlink the (Be2) 4 tetrahedrons with anionic Pt species.…”

“…[26,27] Up to now,s uch behaviour was only reported for intermetallic semiconductors containing alkaline metals.R ecently,s trong charge transfer was observed in the Be-rich complex intermetallic compound Be 21 Pt 5 .I ts band structure already shows asmall pseudo-gap slightly above the Fermi level. [28] This was the motivation to search for semiconducting materials in the beryllium-rich part of the Be-Pt system. Thec hemical challenge here is that the formed compounds challenge conventional valence-counting rules due to the very low number of valence electrons per atom.…”

Y4Be33Pt16 – a non-centrosymmetric cage superconductor with multi-centre bonding in the framework

“…for Be 21 Pt 5 . 7 Intermetallic compounds with complex crystal structures often show unusual physical behaviours. Physics and chemistry of CMA are discussed on the basis of the complexity of their crystal structures, whereby the latter is considered to be the origin of some specific behaviour of these substances.…”