From Ag{sub 2}Sb{sub 2}O{sub 6} to Cd{sub 2}Sb{sub 2}O{sub 7}: Investigations on an anion-deficient to ideal pyrochlore solid solution

Journal Article · Sat Feb 15 00:00:00 EST 2014 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2013.11.007· OSTI ID:22274195

Laurita, Geneva ^[1]; Vielma, Jason ^[2]; Winter, Florian ^[3]; Berthelot, Romain ^[1]; Largeteau, Alain ^[4]; Pöttgen, Rainer ^[3]; Schneider, G. ^[2]

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1. Department of Chemistry, Oregon State University, Corvallis, OR 97331 (United States)
2. Department of Physics, Oregon State University, Corvallis, OR 97331 (United States)
3. Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, D-48149 Münster (Germany)
4. CNRS, Univ. Bordeaux, ICMCB, UPR9048, F-33600 Pessac (France)

A complete solid solution between the anion-deficient pyrochlore Ag{sub 2}Sb{sub 2}O{sub 6} and the ideal pyrochlore Cd{sub 2}Sb{sub 2}O{sub 7} has been synthesized through the standard solid state ceramic method. Each composition has been characterized by various different techniques, including powder X-ray diffraction, optical spectroscopy, electron paramagnetic resonance and {sup 121}Sb Mössbauer spectroscopy. Computational methods based on density functional theory complement this investigation. Photocatalytic activity has been studied, and transport properties have been measured on pellets densified by spark plasma sintering. The analysis of the data collected from these various techniques enables a comprehensive characterization of the complete solid solution and revealed an anomalous behavior in the Cd-rich end of the solid solution, which has been proposed to arise from a possible radical O{sup −} species in small concentrations. - Graphical abstract: A complete solid solution between the anion-deficient pyrochlore Ag{sub 2}Sb{sub 2}O{sub 6} and the ideal pyrochlore Cd{sub 2}Sb{sub 2}O{sub 7} has been synthesized and investigated through various techniques including X-ray diffraction, electron paramagnetic spectroscopy, and {sup 121}Sb-Mössbauer spectroscopy. Optical and electrical measurements have been performed, and computational methods have been applied to determine the density of states. Photocatalytic activity was monitored by the degradation of Methylene Blue, and upon cadmium substitution, the degradation amount decreased, which is attributed primarily to the changing optical and electrical properties of the solid solution. Display Omitted - Highlights: • A complete solid solution between Ag{sub 2}Sb{sub 2}O{sub 6} and Cd{sub 2}Sb{sub 2}O{sub 7} has been synthesized. • XRD reveals a relatively constant lattice parameter as the series progresses. • Optical and electrical properties have been measured for the solid solution. • Computational methods have been used to determine the density of states. • Photocatalytic degradation of Methylene Blue decreased upon cadmium substitution.

• OSTI ID: 22274195
• Journal Information: Journal of Solid State Chemistry, Vol. 210, Issue 1; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANIONS
ANTIMONY 121
CERAMICS
DENSITY
DENSITY FUNCTIONAL METHOD
ELECTRICAL PROPERTIES
ELECTRON SPIN RESONANCE
LATTICE PARAMETERS
METHYLENE BLUE
OPTICAL PROPERTIES
PARAMAGNETISM
PHOTOCATALYSIS
PYROCHLORE
SOLID SOLUTIONS
SOLIDS
SPECTROSCOPY
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION