Electronic ceramic materials are diverse in nature and can be broadly classified into the following five major categories based on their function and application:
Insulating Ceramics: These materials possess excellent electrical insulation properties and are suitable for use as structural components, substrates, and housings in electronic equipment and devices. Representative examples include talc ceramics, alumina ceramics, and high-alumina ceramics. Among these, talc ceramics offer lower costs, while alumina ceramics provide superior electrical insulation; high-alumina ceramics, though exhibiting excellent overall performance, are challenging to manufacture and are relatively expensive.
Capacitor Ceramics: Primarily used in the fabrication of dielectric media for capacitors. High-frequency capacitor ceramics are utilized to produce highly stable ceramic capacitors and temperature-compensating capacitors; low-frequency capacitor ceramics are employed in the manufacture of ceramic capacitors for low-frequency circuits; and semiconductor capacitor ceramics utilize insulating layers formed on the semiconductorized outer surfaces or internal grain boundaries of the ceramic material to serve as the dielectric medium.
Ferroelectric Ceramics: Electronic ceramics in which ferroelectric crystals constitute the dominant crystalline phase. By leveraging their piezoelectric, pyroelectric, and other characteristics, these materials can be used to fabricate novel devices such as piezoelectric components, infrared detectors, laser modulators, and optoelectronic displays.
Semiconductor Ceramics: Ceramics that have been treated to acquire semiconducting grains and insulating grain boundaries, thereby exhibiting semiconductor characteristics-such as strong interfacial potential barriers. This category encompasses a wide range of devices, including various negative temperature coefficient (NTC) thermistors, semiconductor capacitors, varistors, solar cells, humidity sensors, and gas sensors.
Ionic Ceramics: Electronic ceramics characterized by their ability to rapidly transport positive ions. A typical representative of this category is beta-alumina (β-Al₂O₃) ceramic, which can be utilized in the production of solid-state batteries and capacitors with high energy storage densities.