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We report on the experimental study of electrical instabilities in thin film structures on the basis of molybdenum oxides. Thin films of molybdenum oxide are obtained by thermal vacuum evaporation and anodic oxidation. The results of X-ray structural analysis, investigation of optical and electrical properties, are presented. It is shown that the initial vacuum-deposited oxide represents amorphous MoO 3 . In the MOM (metal-oxide-metal) structures with Mo oxide films obtained by the two methods, the effect of electrical switching with an S-shaped current-voltage characteristic is found. We put forward a hypothesis according to which the switching mechanism is associated with the development of electrical instability caused by the insulator-to-metal transition in Mo 8 O 23 . The switching channel, comprising this lower valence oxide, emerges in the initial film during the process of electrical forming of the MOM structure. The obtained results indicate the possibility of application of these structures in oxide micro-and nanoelectronics as electronic switches and other electronic devices.

Results of LiNbO 3 :Zn researches often diverge because sharp changes in physicochemical characteristics of the system melt-crystal that occur at doping are usually not taken into consideration. When a series of doped crystals is grown Zn is usually added to the melt with step 1.5-2 mol%. This obstructs detection of exact threshold concentration. We have grown LiNbO 3 :Zn crystals doped by 4.0Ä9.0 mol% ZnO with step~1 mol%. Around the dopant, threshold concentration step was narrowed to~0.1 mol%. We have researched physicochemical properties of the system meltcrystal and structure evolution by Raman spectroscopy and full-profile analysis of XRD. We have detected exact threshold concentration for LiNbO 3 :Zn and concluded that crystals doped by prethreshold concentrations of ZnO are the best for most applications because of the higher optical homogeneity. K E Y W O R D S doping, lithium niobate, single crystals How to cite this article: Palatnikov MN, Sidorov NV, Makarova OV, Manukovskaya DV, Aljoshina LA, Kadetova AV. Concentration threshold effect on properties of zinc-doped lithium niobate crystals. J

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