Ergänzung und Berichtigung zu: „Kristallstruktur des Hochtemperatur-Jodsilbers α-AgJ“

Strock, Lester W.

doi:10.1515/zpch-1936-3111

Cited by 111 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A number of reports (7)(8)(9)(10)(11)(12)(13) have shown polymorphism in silver iodide. At atmospheric pressure, three forms of silver iodide are said to exist: facecentered cubic, hexagonal, and body-centered cubic forms.…”

mentioning

confidence: 99%

The Electrical Conductivity and the Crystal Structure of Silver Iodide

Takahashi

Kuwabara

Yamamoto

1969

J. Electrochem. Soc.

View full text Add to dashboard Cite

The electrical conductivity of silver iodide pressure moulded into pellets at 2.0 tons/cm2 was measured and the crystal structure of γ‐normalAgI was investigated by means of x‐ray diffraction. The conductivity of γ‐normalAgI decreases gradually as the heating and cooling operations are repeated. The decrease is attributed to the phase transition of γ‐ to β‐phase. In the case of ( β‐normalAgI the conductivity is not changed by the heating procedure. The activation energies of conduction for γ‐normaland β‐normalAgI at near room temperature are about 7.0 and 9.5 kcal/mole respectively. The crystal structure of the compressed γ‐normalAgI differs from the ideal zinc blende structure. The modified structure has been suggested to be the average one which has silver ions distributed randomly over the ideal position of the ideal zinc blende structure and the four positions surrounding the ideal position.

show abstract

mentioning

confidence: 99%

The Electrical Conductivity and the Crystal Structure of Silver Iodide

Takahashi

Kuwabara

Yamamoto

1969

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…The α-phase is a superionic conductor with an ionic conductivity of~1 S/cm [3], whereas the βand γ-phase have low ionic conductivities of 10 −6 to 10 −5 S/cm. The superionic conduction of α-AgI is explained by the melting of the Ag + sublattice, whereas the I − body-centered lattice supports the crystal structure [4][5][6].…”

Section: Introductionmentioning

confidence: 82%

Investigation of AgI-Based Solid Solutions with Ag2CO3

Uchida

Matsushima

2021

Technologies

View full text Add to dashboard Cite

The formation phenomena of silver carbonate (Ag2CO3)–silver iodide (AgI) solid solutions were investigated by X-ray diffraction, thermogravimetry-differential thermal analysis, and electrical conductivity measurement. Results revealed that AgI and Ag2CO3 reacted with each other when mixed at room temperature. The reaction products were classified into three types: (1) AgI-based solid solutions in the AgI-rich region for x = 10% or less in x Ag2CO3–(1 − x) AgI; (2) Ag2CO3-based solid solutions in the Ag2CO3-rich region for x = 60% or more; and (3) silver carbonate iodides in the intermediate range for x between 10% and 60%. For the AgI-based solid solutions, the incorporation of Ag2CO3 into the AgI lattice expanded the unit cell and enhanced electrical conductivity. The solubility limit of Ag2CO3 into the AgI lattice estimated from the differential thermal analysis was x ≈ 5%.

show abstract

“…In the mid-1930s, L.W. Strock was the first to use this technique in order to study the structure of α-AgI [18,19]. His results, see Fig.…”

Section: A Multifaceted Puzzlementioning

confidence: 99%

Marking the Centennial of the Discovery of Alpha Silver Iodide

Funke

2016

View full text Add to dashboard Cite

In 2014, present-day scientists had the opportunity of marking the centennial of a discovery that triggered the development of a new field of research, which is now called Solid State Ionics.In their 1914 paper, Carl Tubandt and Erich Lorenz reported on the extraordinary properties of the alpha phase of silver iodide. Although α-AgI was a crystalline material, it resembled a molten salt with regard to the liquid-like value and weak temperature dependence of its ionic conductivity. With their transference measurements, Tubandt and Lorenz proved that the electric current in α-AgI was completely carried by the silver ions, while the iodide ions formed a rigid lattice. Up to the present day, α-AgI has been considered the fast ion conductor par excellence.In the mid-1930s, L.W. Strock was the first to use x-ray diffraction to investigate the crystal structure of α-AgI. The anion sublattice was found to be body centered cubic, but the arrangement of the silver ions remained a puzzling question. On the one hand, Strock could assign a large number of possible crystallographic sites to them. On the other hand, the state of the silver ions appeared to be rather ‘quasi-molten’ or ‘liquid-like’. This structural puzzle was resolved in 1977, when Cava, Reidinger and Wuensch used the results of a single-crystal neutron-diffraction experiment to construct contour plots for the probability density of the silver ions in α-AgI, which turned out to have broad maxima at the tetrahedral voids of the anion structure, with saddle points between them.A number of novel experimental approaches toward a better understanding of the ion dynamics in α-AgI were suggested by Wilhelm Jost in the 1960s and 1970s. These included high-accuracy specific heat measurements, measurements of the ionic conductivity in the microwave and far-infrared frequency regimes, and quasielastic neutron scattering. The results of the ensuing experiments, involving the present author, did not always provide immediate answers to the long-standing open questions, but rather created new puzzles instead. In this Chapter, an overview is given of the essential steps that were taken in experiment and modeling, eventually leading to the emergence of a self-consistent picture of the structure and dynamics of the mobile silver ions in α-AgI. Notably, that picture included both solid-like and liquid-like aspects. Strictly speaking, however, either category, ‘solid’ and ‘liquid’, had to be considered inappropriate for characterizing the actual state of the silver-ion sublattice.Recently, the transition to a more solid-like behavior of the mobile silver ions was observed in low-temperature α-AgI, which could be stabilized by confinement in glass, as first shown by Tatsumisago et al. Far below the regular phase transition temperature, 147 °C, measurements were performed of the frequency-dependent conductivity of α-AgI, yielding relevant information on the silver-ion dynamics. A conjecture put forward by Jost in 1937 could thus be corroborated by the present author and his coworkers. Below 147 °C, the ‘liquid-like’ activation energy for ionic transport was found to be replaced by a larger, more ‘solid-like’ value, although the anion structure and, therefore, the barriers for elementary displacements of the cations remained essentially unchanged. The underlying mechanism is sketched at the end of the Chapter.

show abstract

Ergänzung und Berichtigung zu: „Kristallstruktur des Hochtemperatur-Jodsilbers α-AgJ“

Cited by 111 publications

References 0 publications

The Electrical Conductivity and the Crystal Structure of Silver Iodide

The Electrical Conductivity and the Crystal Structure of Silver Iodide

Investigation of AgI-Based Solid Solutions with Ag2CO3

Marking the Centennial of the Discovery of Alpha Silver Iodide

Contact Info

Product

Resources

About