New Ag(F1−Cl ) phases for energy storage applications

Thermal decomposition of sodium amide, NaNH2, and sodium amide hydroxide composites, NaNH2–NaOH

“…The minor differences in melting and recrystallization temperatures may be due to sample inhomogeneities or differences in particle size as observed for the AgF-AgCl system. 20 These data show that the composites of NaNH 2 -NaOH have a lower melting temperature as compared to the neat reactants, with the lowest melting temperature for the composition B0.70NaNH 2 -0.30NaOH.…”

“…A linear correlation between compositions and volume is also assumed for the double anion system AgF-AgCl. 20 However, at T = 225 1C, V/Z = 33.58 Å 3 for 'NaOH' and V/Z = 33.79 Å 3 for NaOH. In other words, sodium hydroxide obtained after heating has a slightly smaller volume as compared to that of pristine NaOH (both observed at T = 225 1C and also after cooling to RT in all in situ SR-PXD experiments), and may in fact be a solid solution with anion vacancies, which is further discussed in Section 3.4.…”

“…Melting involves the intermediate Na(OH) 0.70 (NH 2 ) 0.30 and is more complicated than eutectic melting observed for the double anion system AgF-AgCl and many bi-metallic borohydrides. 17,20,26 Solid solutions formed in the two systems NaNH 2 -NaOH and AgF-AgCl are both assumed to follow Vegard's law, i.e. a linear correlation between the volume per formula unit and the composition.…”

Silverland: the Realm of Compounds of Divalent Silver—and Why They are Interesting

“…The experiments have shown that AgF 2 is an insulator, and its conductivity decreases only slightly below the magnetic phase transition at 165 K [40]. Many years later (using impedance spectroscopy, i.e., an ac technique to tunnel the current through the insulating fluoride layers), we have shown that the actual activation energy for conductivity of bulk AgF 2 is ∼ 0.6 eV and this may be partly attributed to ionic conductivity or to excitations from Ag 1+ defects [41]. On the other hand, the resonance bandwidth measured for KAgF 3 showed a large change at the temperature of its magnetic transition (64 K) and it seemed that KAgF 3 could even be metallic close to or above its Néel point [40].…”

Gigantic work function in layered AgF2

“…We now analyze the consequences of such high values in relation to possible interfaces between AgF2 layer and other chemical systems. First, to place the values of W reported above for different forms of AgF2 in context, one may consider the series: Ag metal, Ag2F metal [32], AgF semiconductor [33], AgF2 insulator (Figure 4). Work function of silver metal, for its (110), (100), and (111) surfaces, was experimentally estimated from photoelectric spectra to be 4.52 ± 0.02 eV, 4.64±0.02 eV, and 4.74 ± 0.02 eV, respectively [34,35].…”