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By Nina Orlovskaya, Mykola Lugovy

The target of this booklet is to debate the present prestige of study and improvement of boron-rich solids as sensors, ultra-high temperature ceramics, thermoelectrics, and armor. Novel organic and chemical sensors made from stiff and lightweight boron-rich solids are very interesting and effective for functions in clinical diagnoses, environmental surveillance and the detection of pathogen and biological/chemical terrorism brokers. Ultra-high temperature ceramic composites convey first-class oxidation and corrosion resistance for hypersonic automobile functions. Boron-rich solids also are promising applicants for high-temperature thermoelectric conversion. Armor is one other vitally important program of boron-rich solids, given that such a lot of them show very excessive hardness, which makes them ideal applicants with excessive resistance to ballistic effect. the subsequent topical parts are provided: •Boron-rich solids: technology and know-how •Synthesis and sintering techniques of boron wealthy solids •Microcantilever sensors •Screening of the potential boron-based thermoelectric conversion fabrics; •Ultra-high temperature ZrB2 and HfB2 established composites •Magnetic, shipping and high-pressure houses of boron-rich solids •Restrictions of the sensor dimensions for chemical detection •Armor

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Extra info for Boron Rich Solids: Sensors, Ultra High Temperature Ceramics, Thermoelectrics, Armor (NATO Science for Peace and Security Series B: Physics and Biophysics)

Example text

In the opposite range, where the lengths are large, the piezoelectric strain will have minor effects on the stress intensity in comparison with the self weight of the cantilever. In the length’s interval between these two ranges, where there is a minimum of the stress intensity, the piezoelectric strain and the effect of the self weight are comparable. The critical minimal cantilever length could be found when other conditions, such as applied voltage, material parameters, and the thickness ratio of the two layers, are held constant.

10. M. Lugovy, V. Slyunyayev, V. Subbotin, N. Orlovskaya, and G. Gogotsi, Crack Arrest in Si3N4-based Layered Composites with Residual Stress, Composites Science and Technology, vol. 64, pp. 1947–1957, 2004. 11. E. Srawley, Wide Range Stress Intensity Factor Expressions for ASTM E 399 Standard Fracture Toughness Specimens, International Journal of Fracture, vol. 12, pp. 475–476, 1976. 12. M. Sglavo, L. J. Green, Flaw-Insensitive Ion-Exchanged Glass: I, Theoretical Aspects, vol. 84, pp. 1827–1831, 2001.

At the given voltage the stress intensity is always higher at the interface between piezoelectric and non-piezoelectric layers than that at the free surface of the piezoelectric layer. Therefore, for a given voltage and cantilever’s length the ultimate cantilever’s thickness exists below which the cantilever’s operation becomes unsafe and non-reliable. 87 m at the applied voltage of 5 V and 65 m of the cantilever’s length. 24 M. 5h Gray line y=h parameters on relative thickness of the non-piezoelectric layer (its 1 thickness divided by total thick0 ness of the cantilever) in the 15 V cantilever’s clamped cross-section 10 V -1 for voltage of 5 V are shown in 5V Fig.

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