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a b s t r a c tThe thermoelectric properties of Mo-substituted CrSi 2 were studied. Dense polycrystalline samples of Mo-substituted hexagonal C40 phase Cr 1 À x Mo x Si 2 (x ¼0-0.30) were fabricated by arc melting followed by spark plasma sintering. Mo substitution substantially increases the carrier concentration. The lattice thermal conductivity of CrSi 2 at room temperature was reduced from 9.0 to 4.5 W m À 1 K À 1 by Mo substitution due to enhanced phonon-impurity scattering. The thermoelectric figure of merit, ZT, increases with increasing Mo content because of the reduced lattice thermal conductivity. The maximum ZT value obtained in the present study was 0.23 at 800 K, which was observed for the sample with x ¼ 0.30. This value is significantly greater than that of undoped CrSi 2 (ZT¼ 0.13).

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A double series configuration of a microresonator is proposed to measure the amount of corrosion on iron metal. A numerical computation has been performed for analyzing the sensing operation in which the metal is attached to the waveguide as a top cladding material. The transparency peak profile and transfer function of the output transmission spectrum is obtained using a signal flow graph method and Mason's rule. The output spectrum of the microresonator shows that the linear free spectral range (FSR) changes as the iron begins to oxidize, which affects the cladding index of the sensing system. The FSR changes with respect to the amount of corrosion present in iron metal. In addition, the microresonator is able to distinguish two different types of corrosion, which are hematite and magnetite. The ▻ Authors ▻ Keywords Brought to you by INTERNATIONAL ISLAMIC UNIVERSITY MALAYSIA Search Sources Lists ↗ SciVal Create account Sign in References (39) Author keywords all-optical corrosion sensor double-series microresonator refractive index Indexed keywords Engineering controlled terms: Cladding (coating) Hematite Iron Magnetite Metal analysis Refractive index Resonators Signal flow graphs Engineering uncontrolled terms All optical Corrosion sensor Double series Free spectral range Micro resonators Numerical computations Output transmission Types of corrosions Engineering main heading: Corrosion Funding details

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