12229-63-9Relevant academic research and scientific papers
HIGH PRESSURE SYNTHESES OF ThB12 AND HfB12.
Cannon,Farnsworth
, p. 359 - 368 (1983)
High pressure synthesis techniques were used to prepare ThB//1//2 and HfB//1//2. These compounds have the cubic UB//1//2-type structure with lattice parameters 7. 612(1) A and 7. 377(2) A respectively. The relationship between the lattice parameter for UB//1//2-type dodecaborides and the coordination number 12 radius of the metal atom differs for lanthanide, actinide and transition metal atoms. The prediction is made that it is possible to prepare AmB//1//2 at high pressures.
Preparation, properties and crystal structures of the thorium chromium borides ThCrB4 and ThCr2B6; structure refinements of CeCr2B6, ThB4 and ThB6
Konrad,Jeitschko,Danebrock,Evers
, p. 56 - 61 (2008/10/08)
The new polyborides ThCrB4 and ThCr2B6 were prepared by arc melting of the elemental components, and their crystal structures were determined from single-crystal X-ray data. ThCrB4 has a YCrB4-type structure: Pbam, a = 605.8(1) pm, b = 1171.2(2) pm, c = 364.0(1) pm, R = 0.024 for 714 structure factors and 26 variable parameters. ThCr2B6 is isotypic with CeCr2B6: Immm, a = 315.8(1) pm, b = 659.1(1) pm, c = 836.4(2) pm, R = 0.030 (415 F values, 14 variables). The structures of the borides CeCr2B6, ThB4 and ThB6 were refined from single-crystal X-ray data. The B-B bonds between the B6 octahedra of ThB4 and ThB6 are considerably shorter than those within the octahedra. ThCrB4, ThCr2B6 and CeCr2B6 are metallic conductors and Pauli paramagnetic.
