BaZn2Si2O7 and the solid solution series BaZn2−xCoxSi2O7 (0<x≤2) as high temperature seals for solid oxide fuel cells studied by high-temperature X-ray diffraction and dilatometry

Temperature resistant red and purple ceramic pigments based on the solid solution series BaZn2−xNixSi2O7 and BaMg2−xNixSi2O7

“…Since the Zn containing samples with x ¼ 1.0 and x ¼ 1.5 consist of several different phases, the cell parameters of these compositions were not determined. The samples with x 0.5 show a behavior, known from other solid solution series with the same crystal structure: The values of a and b are getting smaller, whereas the value of c is getting higher [34,29]. The reason for this behavior is unknown.…”

“…It is known from the literature that complete isostructural solid solution series exist in the system BaM 2 Si 2 O 7 with M ¼ Mg, Zn or Co [34,29]. Hence, complete solubility of Ni 2þ in this system is also expected.…”

“…Rapid cooling leads to a freezing of the more statistical state, stable at higher temperatures. Furthermore, this effect might also be attributed to a phase transition known from similar isostructural phases [34,29]. Rapid cooling might cause the stabilization of the HT-modification also at lower temperatures.…”

“…The Software DIFFRAC.EVA was used for analyzing the diffractograms. The cell parameters were determined by the Pawley method using the software TOPAS from Bruker as described in a previous publication [29]. The starting parameters for the refinement were taken from the ICSD-database.…”

Thermal expansion behavior of SrSiO3 and Sr2SiO4 determined by high-temperature X-ray diffraction and dilatometry

“…The measuring time per step was 2 s. Corundum (33 wt%) was used as an internal standard. The cell parameters were calculated from the shift of the peak positions with the Rietveld software TOPAS (BRUKER) as described in a previous publication [17]. The starting values of the refinement were taken from the inorganic crystal structure database (SrSiO 3 : ICSD 261228, Sr 2 SiO 4 : ICSD 36667).…”