Peculiarities of unusual electret state in porous zeolite microstructure. (November 2017)

• Record Type: Journal Article
• Authors: Bunyatova, U.; Orbukh, V.I.; Eyvazova, G.M.; Lebedeva, N.N.; Agamaliev, Z.A.; Koçum, I.C.; Ozer, M.; Salamov, B.G.
• Is Part Of: Superlattices and microstructures. Volume 111(2017)
• Page Start: 1203
• Page End: 1210
• Publication Date: 2017-11
• Subjects: Electret state -- Porous zeolite -- Hysteresis loop -- Nanoparticles -- Dielectric spectra; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2017.08.024
• Languages: English
• ISSNs: 0749-6036

Abstract

Abstract: This study explores, for the first time to our knowledge, the influence of electret state on the dielectric parameters of porous zeolite of frequencies up to 10 6 Hz, at room temperature and normal atmospheric pressure. The I-V characteristics with unusual hysteresis loop in the wide pressure range were measured on zeolite plates having three different material characteristics: A) plate, cut out from a monoblock natural zeolite; B) plate, modified by silver ions, and C) plate containing silver nanoparticles. Zeolite samples were exposed to an electric field (Ep = 2 kV cm −1 ) in an air atmosphere for 240 min. It is established, that the stability of electret state and value of the dielectric response ε′ and ε″ for clinoptilolite Ag nanoparticles containing plates changed under influence of DC electric field. During some time the dielectric response is restored and observed unique phenomenon indicates on the electret behavior of clinoptilolite samples. These changes are observed within a few days consequently, there is long-term dynamics of the dielectric response changes. This interpretation is based on the assumption that due influence of the dc electric field part of the silver atoms in nanoparticles decays into ions and electrons. Graphical abstract: Time dependence of the dielectric response for silver-modified zeolite Ag 0 after turning off the DC electric field. Highlights: Peculiarities of unusual electret state (ES) in nanoporous zeolite microstructure is studied. The I-V characteristic with hysteresis loop in the wide pressure range is described. It was found the influence of electric field on the stability of ES and dielectric response value. The dielectric response has long-term dynamics, which indicates on the electret state.