Die Struktur der Diboride von Gold und Silber

Preparation of Ag-doped Mg1−xAgxB2 superconductors

“…1996 JCPDS: 01-1167). It seems that under our experimental conditions the elementary Ag did not react with boron, which is consistent with the earlier report [14].…”

High-energy ball-milling for the synthesis of Ag–B superconducting materials

“…There are no known phase diagrams for the Ag-B system, and Ag and B are generally known to be mutually insoluble in both solid and liquid states. On the other hand, it has been claimed that the compound AgB 2 was synthesized at an unspecified temperature and identified as having a hexagonal structure (AlB 2 structure) [11]. Following examinations reported, the alloy (66.6 at.% B), which was annealed for 2 months at 900 • C, did not reveal the existence of AgB 2 .…”

On the controversial formation of silver diboride: Processing of Ag+2B powders by spark plasma sintering

“…To further verify if the new phase could be interpreted as the AgB 2 product, the corresponding lattice data reported in the literature [3], i.e. a = 0.300 nm and c = 0.324 nm, were employed as starting parameters during the calculation by the Rietveld method.…”

“…First attempts for the cementation of Ag or Au with B were reported to fail [1 and references therein]. Conversely, it was subsequently reported that both noble metals are able to react with boron at high temperatures to produce the corresponding diboride compounds [2,3]. Moreover, X-ray diffraction analysis conducted on the obtained phases evidenced they crystallized hexagonally in the C-32 system and allowed for the estimation of AgB 2 (a = 3.00 Å, c/a = 1.08) and AuB 2 (a = 3.14 Å, c/a = 1.12) lattice parameters.…”