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Author Farid, Muhammad Asim ♦ Asghar, Muhammad Adnan ♦ Ashiq, Muhammad Naeem ♦ Ehsan, Muhammad Fahad ♦ Athar, Muhammad
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ CONCENTRATION RATIO ♦ DIELECTRIC MATERIALS ♦ DOPED MATERIALS ♦ ELECTRIC CONDUCTIVITY ♦ FOURIER TRANSFORMATION ♦ GERMANIUM ♦ HYDROTHERMAL SYNTHESIS ♦ INFRARED SPECTRA ♦ KHZ RANGE ♦ LANTHANUM COMPOUNDS ♦ MHZ RANGE ♦ MICROWAVE RADIATION ♦ NANOMATERIALS ♦ NANOSTRUCTURES ♦ PERMITTIVITY ♦ TEMPERATURE RANGE 0273-0400 K ♦ VANADIUM ♦ X-RAY DIFFRACTION ♦ X-RAY FLUORESCENCE ANALYSIS ♦ ZIRCONATES
Abstract Graphical abstract: Variation of dielectric constant with frequency for all the synthesized materials. - Highlights: • Hydrothermal method has been successfully employed to synthesize the zirconates. • XRD confirmed the formation of required phase. • Increased electrical resistivity makes these materials useful for microwave devices. • Dielectric parameters of zirconates decrease with increasing frequency. • Dielectric constant decreases with increasing substituents concentration. - Abstract: A hydrothermal method was successfully employed for the synthesis of a series of vanadium and germanium co-doped pyrochlore lanthanum zirconates with composition La{sub 2−x}V{sub x}Zr{sub 2−y}Ge{sub y}O{sub 7} (where x, y = 0.0, 0.25, 0.50, 0.75 and 1.0). The XRD and FTIR analyses confirmed the formation of single phase except vanadium and germanium substituted samples and the crystallite sizes are in the range of 7–31 nm for V{sup 3+}–Ge{sup 4+} substituted samples. The theoretical compositions are confirmed by the ED-XRF studies. The room temperature electrical resistivity increase with the substituents concentration which suggests that the synthesized materials can be used for microwave devices as such devices required highly resistive materials. Dielectric properties were measured in the frequency range of 6 kHz to 1 MHz. The dielectric parameters decrease with increase in frequency. The DC resistivity data is in good agreement with the dielectric data.
ISSN 00255408
Educational Use Research
Learning Resource Type Article
Publisher Date 2014-11-15
Publisher Place United States
Journal Materials Research Bulletin
Volume Number 59


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