Crystal Growth of Two New Niobates, La2KNbO6 and Nd2KNbO6: Structural, Dielectric, Photophysical, and Photocatalytic Properties

Single crystals of La2KNbO6 and Nd2KNbO6, space group C2/m, a = 12.746(2) Å, b = 5.7906(1) Å, c = 8.8719(2) Å, β = 105.965(1)° and a = 12.545(3) Å, b = 5.6985(1) Å, c = 8.7196(2) Å, β = 105.803(1)°, respectively, were grown out of a reactive hydroxide melt. The two niobates crystallize in a new stru...

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Published in:Chemistry of materials 2008-05, Vol.20 (10), p.3327-3335
Main Authors: Roof, Irina P, Park, Sangmoon, Vogt, Tom, Rassolov, Vitaly, Smith, Mark D, Omar, Shobit, Nino, Juan
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Language:English
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Crystal Growth
Inorganic Solids and Ceramics
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container_end_page 3335
container_issue 10
container_start_page 3327
container_title Chemistry of materials
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creator Roof, Irina P
Park, Sangmoon
Vogt, Tom
Rassolov, Vitaly
Smith, Mark D
Omar, Shobit
Nino, Juan
description Single crystals of La2KNbO6 and Nd2KNbO6, space group C2/m, a = 12.746(2) Å, b = 5.7906(1) Å, c = 8.8719(2) Å, β = 105.965(1)° and a = 12.545(3) Å, b = 5.6985(1) Å, c = 8.7196(2) Å, β = 105.803(1)°, respectively, were grown out of a reactive hydroxide melt. The two niobates crystallize in a new structure type in which niobium is located in a rare 5-coordinate, square pyramidal coordination environment. La2KNbO6 exhibits room-temperature photoluminescence with bright blue emission upon excitation at 260 nm. Semiempirical PM6 calculations were performed to better understand the origin of the photoluminescence. The dielectric properties of La2KNbO6 were measured from −150 to 200 °C at four different frequencies. Finally, to assess the photocatalytic properties of La2KNbO6, the photocatalytic degradation of methylene blue by La2KNbO6 was determined.
doi_str_mv 10.1021/cm703479k
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title Crystal Growth of Two New Niobates, La2KNbO6 and Nd2KNbO6: Structural, Dielectric, Photophysical, and Photocatalytic Properties
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