Investigations on structure and physical properties of some new members of the LaPd2O4 family

被引:16
作者
Kramer, G
Hagele, E
Wagner, N
Jansen, M
机构
来源
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 1996年 / 622卷 / 06期
关键词
ternary oxopalladates; mixed valent palladium; high pressure synthesis; crystal structure; magnetic properties; electrical conductivity;
D O I
10.1002/zaac.19966220617
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The new mixed valent oxopalladates MPd(2)O(4) (M = Pr, Nd, Gd, Y) have been synthesized from the binary oxides in presence of a solid oxygen carrier (KClO3) by applying hydrostatic pressure (ca. 2 GPa). According to X-ray investigations these oxides crystallize in space groupe I4(1)/a (No. 88) and are isotypic to LaPd2O4 (PrPd2O4: a = 5.8382(2), c = 10.1687(5)A; NdPd2O,: a = 5.8419(3), c = 10.1949(6) A; GdPd2O4,: a = 5.7799(3), c = 10.0677(8) A; YPd2,O-4: a = 5.7359(3), c = 9.9829(8) A). The crystal structure consists of square planar PdO4, units which are stacked to form columnar arrangements along [100] and [010], respectively. The PdO4, squares are connected via common corners to a three-dimensional framework. By substitution of Pr3+, Nd3+, Gd3+ and Y3+ for lanthanum the Pd-Pd distances decrease and the electrical conductivities increase. The oxopalladates investigated in this work are black, paramagnetic and semiconducting. At ambient pressure they decompose at temperatures above 880 K into elemental palladium and the binary rare earth oxides.
引用
收藏
页码:1027 / 1034
页数:8
相关论文
共 26 条
  • [1] ARPE R, 1976, Z NATURFORSCH B, V31, P1708
  • [2] POSSIBLE HIGH-TC SUPERCONDUCTIVITY IN THE BA-LA-CU-O SYSTEM
    BEDNORZ, JG
    MULLER, KA
    [J]. ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1986, 64 (02): : 189 - 193
  • [3] PLATINUM BRONZES .2. CRYSTAL-STRUCTURES OF CAPT2O4 AND CD3.3PT3O4
    CAHEN, D
    IBERS, JA
    MUELLER, MH
    [J]. INORGANIC CHEMISTRY, 1974, 13 (01) : 110 - 115
  • [4] CAHEN D, 1972, INORG CHEM, V11, P2313
  • [5] Carlin R. L., 1986, MAGNETOCHEMISTRY
  • [6] MAGNETIC PROPERTIES OF GADOLINIUM ORTHO-ALUMINATE
    CASHION, JD
    COOKE, AH
    THORP, TL
    WELLS, MR
    [J]. PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1970, 318 (1535): : 473 - &
  • [7] CONFLANT P, 1977, REV CHIM MINER, V14, P249
  • [8] *FIRM STOE CIE, 1987, PROGR CSDV4 10
  • [9] GEB J, UNPUB J SOLID STATE
  • [10] The atomic theoretical analysis of the magnetism of rare earth
    Hund, F
    [J]. ZEITSCHRIFT FUR PHYSIK, 1925, 33 : 855 - 859