Associate Professor Shinobu Aoyagi of Nagoya City University, in collaboration with the High Brightness Photon Science Research Center (JASRI) and Hiroshima University, elucidated the vibration mechanism of the crystal oscillator for the first time in the world.Although crystal oscillators are used in various devices around us such as watches, the principle of their operation was not well understood.

 Quartz is a substance consisting of silicon and oxygen that is abundant on the earth.In addition to being used for accessories, it is also used in various places such as electronic devices.An important property of an electronic component is that it emits an electrical signal with an extremely stable frequency, making it an indispensable component for measuring time.Despite its widespread use, it remained unclear why such stable signals were produced.

 Silicon and oxygen atoms in quartz are positively and negatively charged, respectively.It has been thought that when a voltage is applied to this crystal, silicon ions and oxygen ions vibrate alternately in opposite directions to generate an electrical signal.However, the chemical bond between silicon and oxygen is strong, and it remains a question whether such vibration is possible.In order to solve this mystery, it is necessary to directly observe the movement of atoms, but the movement of the crystal is so small that it was difficult with conventional measurement methods.The group succeeded in amplifying this movement by aligning the period of vibration of the crystal and the period of applying voltage.It is the same principle that if you press the bell of the temple regularly, you can make a big shake with just one finger.This made it possible to directly measure the movement of the atoms inside.As a result, it became clear that the atoms do not oscillate alternately, but oscillate so that the direction of the chemical bond changes.

 The mechanism by which a crystal emits an electrical signal has been clarified, but according to the group, there is a possibility that this principle can be applied to a technology that efficiently converts the kinetic energy of an atom into electrical energy.In the future, we will explore whether it can lead to innovative power generation methods.

Hiroshima University

Learning to design your own life.To the world's top 100 universities that create knowledge

Under the five principles of "spirit of seeking peace," "creation of new knowledge," "education that cultivates abundant humanity," "coexistence with local and international communities," and "continuous self-transformation," 5 faculties and 12 studies A comprehensive research university with a department.While promoting university reform with both educational and research capabilities, we will continuously produce global human resources and gain knowledge […]

Nagoya City University

Fostering excellent human resources who will lead the next generation, energetically challenging international and interdisciplinary research

Opened as a public university consisting of medical and pharmaceutical schools, it is now an urban university consisting of 7 faculties and 7 graduate schools. In 2016, the Graduate School of Economics "Medical Economics Management Course", the Graduate School of Medicine "Clinical Medical Design", and the Graduate School of Human Culture "Clinical Psychology Course" were established, opening up new academic fields. …]

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