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handbook of modern sensors

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576 Appendix<br />

Table A.24. Electronic Ceramics (Between 25 ◦ C and 100 ◦ C)<br />

96% Beryllia Boron Aluminum Silicon Silicon<br />

Alumina (BeO) Nitrade Nitrade Carbide (Si)<br />

(Al 2 O 3 ) (BN) (AlN) (SiC)<br />

Hardness, Knopp 2000 1000 280 1200 2800 —<br />

(kg/mm 2 )<br />

Flexural strength 3.0 1.7–2.4 0.8 4.9 4.4 —<br />

(10 5 N/m 2 )<br />

Thermal conductivity 21 250 60 170–200 70 150<br />

(W/(m K)<br />

Thermal expansion 7.1 8.8 0.0 4.1 3.8 3.8<br />

(10 −6 /K)<br />

Dielectric strength 8.3 19.7 37.4 14.0 15.4 —<br />

(kV/mm)<br />

Dielectric loss 3–5 4–7 4 5–10 500 —<br />

(10 −4 tan delta at<br />

1 MHz)<br />

Dielectric 10 7.0 4.0 8.8 40 —<br />

constant, κ<br />

(at 10 MHz)

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