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Piezoelectric ceramics are composed of lead titanate PbTiO3, lead zirconate PbZrO3 and lead niobium magnesium tri-oxide Pb( Mg 1/3, Nb 2/3)O3. These ceramics are made by sintering moulded powders ; powder formation allows piezoelectric ceramics to be produced in a great variety of shapes compared to piezoelectric single crystals. The applications of PCM include:
This ferrite, which has excellent magnetic properties, is manufactured by sintering under high pressure. Initial magnetic permeability is 30,000;porosity is less than 0.1%.
Due to its high density and strength, hot-pressed Mn-Zn ferrite is suitable for high-precision machine processing and examples of its applications include magnetic recording/playback heads for audio or video tape recorders, computers and measuring apparatus.
|Initial permeability (at lkHz)||30,000|
These heads, made of hot-pressed Mn-Zn ferrite (see N-2-3-10 above), are mechanically processed with great precision according to the design of the head itself and the gap across which the tape must pass during recording and playback. Hot-pressed ferrite heads give outstanding, stable performance up to high frequencies. They are extremely hard-wearing compared to heads made from conventional materials.
Ferromagnetic garnets have the same crystalline structure as natural garnets. They are used in communication equipment.
Magnetic loss in the microwave region and energy loss due to mechanical vibration at high frequencies are very small.
Since AI-YIG single crystals have magnetic resonance of very narrow width and loss is negligible they can be applied very successfully to microwave filters.
The contents of this site are excerpted from THE OFFICIAL RECORD OF TIME CAPSULE EXPO'70(March 1975). Please note that company and organization names may differ from those of the current ones.
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