Advanced Piezoelectric Crystals of Langasite Family
A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Materials".
Deadline for manuscript submissions: closed (30 June 2021) | Viewed by 8777
Special Issue Editor
Interests: crystal growth; piezoelectric crystals; ferroelectric crystals; ferroelectric domain structure; X-ray diffraction; synchrotron radiation; crystal structure; crystal structure defects; surface acoustic waves; bulk acoustic waves
Special Issue Information
The development and search for new promising materials of the lanthanum–gallium silicate (LGS, La3Ga5SiO14) group with unique thermal properties are very important for progress in acoustoelectronics based on the application of surface and bulk acoustic waves. Crystals of the lanthanum–gallium silicate group belong to the 32 symmetry class-like crystals of SiO2 piezoquartz. In this group, several hundreds of crystals can be synthesized which can find application not only in acoustoelectronics but also in acoustooptics, optoelectronics, magnitooptics, and magnitoacoustics. Materials of this group possess high thermal stability.
The values of electromechanical coupling coefficients and piezoelectric constants of the LGS group, although lower than those of LiNbO3 crystals, exceed the corresponding values of quartz crystals by several fold. Note, also, that the interest in crystals of the langasite group is due to the absence of phase transitions in these crystals up to the melting temperature.
Currently, significant progress has been made in growing crystals up to 4 inches in diameter using the Czochralski method. At present, the issues of structural difference between ordered and disordered crystals of the LGS family remain open. The study of temperature dependences of both structural and physical properties, which is fundamentally important for various applications, including high-temperature sensors of physical quantities, is also important.
This Special Issue intends to collect and disseminate results in the synthesis and study of properties of LGS family crystals. We welcome publications on topics ranging from crystal growth to studies of structure, piezoelectric, optical, and acoustic properties. Publications related to applications of these crystals in sensors and acousto- and optoelectronics will also be of special importance.
We hope that this Special Issue of Crystals will bring gather the latest results, making them available to a large number of researchers.
Prof. Dr. Dmitry Roshchupkin
Guest Editor
Manuscript Submission Information
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Keywords
- langasite
- ordered and disordered crystals
- crystal structure
- piezoelectric modulus
- surface and bulk acoustic waves
- QCM
- thermal stability