The title compound was prepared from the pure elements by sintering. The crystal structure was investigated by means of powder X-ray diffraction data. Ho5Pd19P12 exhibits the hexagonal Ho5Ni19P12-type structure with space group P 6 ‾ 2 m $P‾{6}2m$ , a = 13.1342(2), c = 3.9839(1) Å, R I = 0.060, R p = 0.080. The crystal structure can be described as a combination of two types of the structural units, [HoPd6P3] and [Ho3Pd10P6], respectively, mutually displaced by 1/2 along the crystallographic c axis. Quantum chemical calculations have been performed to analyze the electronic structure and provide deeper insight into the structure-property relationships. The results of the quantum chemical calculations indicate that the material features metallic bonding between Ho and Pd and covalent bonding between Pd and P.

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The crystal structure of the new ternary phosphideTm5Pd9P7 was determined from powder X‐ray diffraction data: space group P6‾ , a=9.9971(2), c=3.94371(8) Å, RI=0.0518, Rp=0.0667, Rp=0.0667, wRp=0.1065. The crystal structure of the phosphide Tm5Pd9P7 is closely related with the Zr2Fe12P7‐type, and is formed by combination of two types of structural units with the compositions [TmPd6P3] and [TmTm3Pd3P3] mutually displaced by 1/2 along the c axis. Connection of the last units forms the trigonal prisms [Tm6] around P3 atoms in the crystallographic position 1a (0 0 0). The isotypic ternary phosphide Lu5Pd9P7 was synthesized (a=9.9934(7), c=3.9207(4) Å). The electronic and bonding properties of Tm5Pd9P7 are obtained from tight binding linear muffin‐tin orbital (TB‐LMTO) calculations and a crystal orbital Hamiltonian population (COHP) bonding analysis. These analyses show strong covalent bonding within (Pd9P7)15− nanotubes which are ionically bound via the Tm atoms to three dimensional network.

Рентгеноструктурним методом полікристала вивчено кристалічну структуру нового тернарного алюмініду ErAg0,77Al2,23: просторова група R-3m, символ Пірсона hR36, структурний тип PuNi3, a = 0,55049(1) нм, c = 2,61415(6) нм, RI = 0,0450; RP = 0,0314; wRP = 0,0430. У структурі сполуки простежується часткове впорядкування у розташуванні атомів меншого розміру, зокрема, правильна система точок 6с повністю зайнята атомами Ag, натомість у позиціях 3b та 18h міститься статистична суміш атомів Ag i Al. Новий алюмінід перебуває у термодинамічній рівновазі із тернарними сполуками ErAg2,5Al2,5 (структура типу DyAg2,4Al2,6) та Er8Ag17Al49 (структура типу Yb8Cu17Al49).