TaRhGe with TiNiSi-type Structure

Abstract

The new germanide TaRhGe was prepared from the elements by arc-melting and subsequent annealing at 1020 K for 10 days. TaRhGe crystallizes with the TiNiSi-type structure, space group Pnma, Z = 4, oP12, a = 640.2(2), b = 383.2(2), c = 741.7(2) pm, wR2 = 0.0550, 432 F2 values, 20 parameters. The structure consists of a three-dimensional [RhGe] network of distorted RhGe4/4 tetrahedra with Rh-Ge distances ranging from 244 to 250 pm. The tantalum atoms are coordinated within this network by two folded and mutually tilted Rh3Ge3 hexagons. TaRhGe is Pauli-paramagnetic and shows no superconducting transition down to 3 K

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

“…Considering the sum of the covalent radii (256 pm), these interactions are weak. This bonding situation is different to equiatomic TaRhGe, [3] where the tantalum atoms have closer Ta-Ge (269-277 pm) and longer Ta-Rh (293-304 pm) contacts.…”

“…The latter shift towards each other (along the a axis) and the inter-and intralayer Rh-Ge distances are similar. The Rh 3 Ge 3 hexagons in equiatomic TaRhGe [3] show different puckering. The shortest interatomic distances in the Ce 3 TaRh 4 Ge 4 structure occur between the rhodium and germanium atoms with a range from 253 to 271 pm, slightly longer than the sum of the covalent radii [19] for Rh + Ge of 247 pm.…”

“…-9 eV and Ge-p states are then observed underneath Ce, Rh, and Ta states in the up-www.zaac.wiley-vch.de ARTICLE Figure 3. Coordination of the cerium and tantalum atoms in Ce 3 TaRh 4 Ge 4 , TaRhGe, [3] CeZnGe, [32] and the two modifications of CeRhGe. [5] Cerium, tantalum, rhodium, and germanium atoms are drawn as light grey, black, blue and magenta circles, respectively.…”

“…A remarkable example is the germanide TaRhGe, [3] which was obtained as a by-product during synthesis attempts of lithium-rhodium-germanides. [4] A targeted synthesis of Ce 3 TaRh 4 Ge 4 structure.…”

Investigating the normal state and superconducting state properties of orthorhombic and hexagonal ZrRuP: A first-principles study

“…Equiatomic intermetallic T T X compounds (T : electronpoor transition metal, T : electron-rich transition metal, X : P, As, and Si) have been widely investigated in the least 50 years with respect to their interesting structural [1][2][3][4][5][6][7][8][9][10][11][12][13] and magnetic [14][15][16][17][18][19][20][21][22][23][24][25][26] properties. Related to the size and the electron count of the transition metal, these compounds either exist in the orthorhombic TiNiSi-type structure [1] or the hexagonal ZrNiAl-type structure [3].…”