Atomic and Electronic Structure of Zinc and Copper Pyrovanadates with Negative Thermal Expansion

Abstract:

Zinc and copper pyrovanadates are promising materials for micro- and optoelectronics due to their negative coefficient of volume thermal expansion (NTE). Besides, solid solutions on the base of these compounds can be used to obtain grade materials with variable thermal coefficients. Thermal deformation of both Zn2V2O7 and Cu2V2O7 structures was studied. According to the structural data, NTE of these substances is provided by the zigzag shape of zinc (copper) chains alongside with stable distances between layers. The structural and electronic characteristics depending on temperature were studied for α-Zn2V2O7 and α-Cu2V2O7 by using the first principle method. Our results demonstrate that the lowest total energies corresponds to the structural parameters at 400° C and 200° C for α-Zn2V2O7 and α-Cu2V2O7, respectively. We predict that α- Zn2V2O7 is a semiconductor with the band gap of 1,5 эВ and the bottom of conduction band is determined by the vanadium 3d states with small addition of antibonding oxygen 2р-states. For α- Cu2V2O7, the lowest interband transitions correspond to energy of 1,6 eV and involve also the O2p and V 3d states.

• Periodical: Advances in Science and Technology (Volume 63)
• Pages: 358-363
• DOI: https://doi.org/10.4028/www.scientific.net/AST.63.358
• Online since: October 2010
• Authors: Tatiana Krasnenko, Nadezhda Medvedeva, Vitalii G. Bamburov
• Keywords: Atomic Structure, Copper Pyrovanadate, Electronic Structure, Negative Thermal Expansion, Zinc Pyrovanadate

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