Ceramics Electrical Resistivity

Ceramic materials offer a number of benefits in a variety of applications.

Ceramics electrical resistivity.

Aluminas aluminum oxide al 2 o 3 are a commonly used technical ceramic with a range of high performance properties including excellent dielectric behavior. High purity alumina advanced ceramics 94 have the highest resistivity values 1 10 14 followed by aluminium nitride 1 10 12 sintered silicon nitride 1 10 10 and zirconia 1. Sic ceramics with added be had an extremely high electrical resistivity of 3 10 12 cm. On the other hand sic ceramics with added b and al had electrical resistivities of 2 10 and 0 8 cm respectively.

They provide high wear heat and corrosion resistance as well as high tensile strength volume resistivity dielectric strength and modulus of elasticity. Despite of very low electrical conductivity of most of the ceramic materials there are ceramics possessing superconductivity properties near to zero electric resistivity. Lanthanum yttrium barium copper oxide ceramic may be superconducting at temperature as high as 138 k. Aluminum nitrides aln are used in many.

The differences in the electrical resistivity of the dense sic ceramics were considered to be due to different solubilities of the. The si unit of electrical resistivity is the ohm metre and corresponds to the resistance measurement of a test piece of a given cross section and length. In addition to the well known physical properties of ceramic materials hardness compressive strength brittleness there is the property of electric resistivity most ceramics resist the flow of electric current and for this reason ceramic materials such as.