Degradation Phenomenon in Semiconductive Nanoamorphous Structures from Molybdenum Oxide
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0887-Q06-08.1
Degradation Phenomenon in Semiconductive Nanoamorphous Structures from Molybdenum Oxide. Markosyan A., Kamanchadgyan S., Malkhasyan R. Scientific Production Enterprise “ATOM”, Tevosyan st. 3/1 Yerevan 375076, Republic of Armenia, email: [email protected]
ABSTRACT The condition of degradation of electrical properties of samples prepared from powder of nanoamorphous semiconductive oxide in the course of time is discovered and studied when investigating electro-physical properties of the given materials for the first time synthesized at Scientific Production Enterprise “ATOM”. It has been shown that degradation phenomenon is also present in amorphous materials, which relies on the configuration of the pores of the sample. The resistance of sample in the open air changes over a period of several months. However, it decreases and is comparatively fast stabilized when placed in vacuum. The absorption and de-absorption of different gases have diffusion nature and highly depend on environment temperature. Water steam in atmosphere has been determined to be the main cause of degradation.
INTRODUCTION It is well known that at the beginning the nano-crystal materials played important role in evolution of nanotechnology [1]. Nanoamorphous material investigation gained significant interest in recent years [2, 3]. At the time being one of the major interests for scientists and engineers is to obtain highly dispersive and sensitive materials which are nanoamorphous substances. Amorphous materials possess bigger specific surface area and have additional activity due to presence of particles with surplus internal energy. Nevertheless appliance of nanoamorphous materials in technology is still limited, because of high sensitivity of the latter to environmental conditions. For example, a degradation phenomenon can be observed on samples prepared from powder of Nanoamorphous Molybdenum Oxide (MoO*2), which shows up in daily increase of resistance. The increase in resistance in one order has been recorded at usual atmospheric conditions. Degradation phenomenon has already been investigated [4] and is explained by presence of dislocations in material. However, the causes of degradation described in the present paper for a sample prepared from molybdenum oxide are completely different as the pure amorphous material is free of dislocation phenomenon. Here results of investigation of degradation phenomenon performed on MoO*2 samples [3] are presented. It is shown that MoO*2 samples expose degradation phenomenon, which is, however caused by configuration of pores and types of gases absorbed by these pores.
0887-Q06-08.2
EXPERIMENT The degradation phenomenon has been observed and investigated on two-contact samples (with size 14.5×6.5×1.5 mm) prepared from powder of Nanoamorphous Molybdenum Oxide (MoO*2) via mechanical pressing. This oxide (grain size 10÷15 nm) has been made from nanoamorphous molybdenum Mo (grain size 3÷4.5 nm) under strongly controllable conditions. In our work the change in the resistance of the sample
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