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Decomposition of silver carbonate; the crystal structure of two high-temperature modifications of Ag2CO3

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Dinnebier,  R. E.
Scientific Facility X-Ray Diffraction (Robert E. Dinnebier), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Norby, P., Dinnebier, R. E., & Fitch, A. N. (2002). Decomposition of silver carbonate; the crystal structure of two high-temperature modifications of Ag2CO3. Inorganic Chemistry, 41(14), 3628-3637.


Cite as: https://hdl.handle.net/21.11116/0000-000E-F42E-C
Abstract
High-resolution powder diffraction was used to study the
thermal transformation of silver carbonate. A sample of Ag2CO3
was heated in a capillary under 4.5 atm CO2 pressure. The
decomposition temperature of silver carbonate to silver oxide
is thereby increased, allowing high-resolution synchrotron X-
ray powder diffraction patterns of the two high-temperature
phases of Ag2CO3 to be collected. The structure of the low-
temperature (lt) phase was confirmed, and the structures of the
two high-temperature phases were determined by direct methods
and refined using the Rietveld method: It-Ag2CO3 (295 K)
P2(1)/m, z = 2, a = 4.8521(2) Angstrom, b = 9.5489(4) Angstrom,
c = 3.2536(1) Angstrom, = 91.9713(3)degrees; beta-Ag2CO3 (453
K) P31c, z = 6, a = 9.1716(4) Angstrom, c = 6.5176(3) Angstrom;
alpha-Ag2CO3 (476 K) P (6) over bar 2m, z = 3, a = 9.0924(4)
Angstrom, c = 3.3249(1) Angstrom. In addition, thermal
expansion properties, anisotropic microstrain distributions,
and thermal transformations of the three silver carbonate
phases and silver oxide are described.