Cerium intermetallics with TiNiSi-type structure

Abstract

Intermetallic compounds with the equiatomic composition CeTX that crystallize with the orthorhombic TiNiSi-type structure can be synthesized with electronrich transition metals (T) and X = Zn, Al, Ga, Si, Ge, Sn, As, Sb, and Bi. The present review focusses on the crystal chemistry and chemical bonding of these CeTX phases and on their physical properties, 119 Sn and 121 Sb Mössbauer spectra, high-pressure effects, hydrogenation reactions and the formation of solid solutions in order to elucidate structure-property relationships. This paper is the final one of a series of four reviews on equiatomic intermetallic cerium compounds [Part I

Quaternary Germanides RE3TRh4Ge4 (RE = Ce, Pr, Nd; T = Nb, Ta) – A New Coloring Variant of the Aristotype AlB2

“…[22,23] In contrast to the equiatomic compounds we observe two different colorings for Bärnighausen formalism [24][25][26] is presented in Figure 2. The symmetry reduction proceeds by the hexagonal branch of the Bärnighausen tree from the aristotype by the Ni 2 In [27] / ZrBeSi type [28] to the pair UPt 2 [29] / YAlGe.…”

Chemical bonding in equiatomic cerium intermetallics – The case of CeMgSn, CePdSn, and CeMgPb

“…In continuation of our systematic studies on equiatomic cerium intermetallics [1][2][3], we have recently investigated the chemical bonding peculiarities in the ZrNiAl type series CeMgGa vs. CeMgPd [17]. Electronic structure calculations revealed a substantially higher cohesive energy and a more directional bonding for the palladium as compared to the gallium compound.…”

“…2) which again shows a change in structure type. The bonding peculiarities of the structurally related stannides and plumbides CeNiSn, CePtSn and CePdPb have already been studied and are summarized in review articles [1][2][3].…”

“…Roughly one can subdivide these phases into three groups: (i) CeTX intermetallics with ZrNiAl type structure, (ii) CeTX phases with TiNiSi structure, and (iii) CeTX compounds with more complex structures. These three groups of materials have recently been reviewed [1][2][3]. The magnetic ground state of these CeTX intermetallics strongly depends on the Ce(4f )-T(nd) hybridization, leading to intermediate valence, non-magnetic Kondo lattices, antiferromagnetic or ferromagnetic ordering.…”

Crystal Structure, Spectroscopic Investigations, and Physical Properties of the Ternary Intermetallic REPt2Al3 (RE = Y, Dy–Tm) and RE2Pt3Al4 Representatives (RE = Tm, Lu)

“…For ternary intermetallic compounds, the tetragonal body-centered ThCr 2 Si 2 -type (I4/mmm, >3250 entries) [8], the orthorhombic TiNiSi-type (Pnma, >1550 entries), and the hexagonal ZrNiAl-type (P62m, >1450 entries) [9] representatives show a broad variety of compounds with numerous, different elemental combinations. The structures and physical properties of the equiatomic RETX (RE = rare-earth element, T = transition metal, X = element of group [12][13][14][15] representatives have been recently summarized in a series of review articles [10][11][12][13].…”