PIEZOELECTRIC ELEMENT

• Main Authors: OHASHI YUJI, INOUE KENJI, KUDO TETSUO, ISHIDA YASUAKI, YOSHIKAWA AKIRA, TAKASUGI SHIGE, YOKOTA YUI
• Format: Patent
• Language: English; Japanese
• Published: 25.06.2020
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR; CHEMISTRY; CRYSTAL GROWTH; ELECTRICITY; METALLURGY; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; REFINING BY ZONE-MELTING OF MATERIAL; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; SINGLE-CRYSTAL-GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL

To further miniaturize a piezoelectric element made of an oxide crystal having a Langasite structure in a state where desired performance is obtained.SOLUTION: A piezoelectric single crystal body used as a coil spring 101 is composed of an oxide having a Langasite structure having a composition included in the group consisting of REGaAlSiO(where RE represents rare earth, 0≤x≤5), RETaGaAlO(where RE represents rare earth, 0<x≤5.5), RENbGaAlO(where RE represents rare earth, 0≤x≤5.5), AETa(GaAl)SiO(where AE represents alkaline earth metal and 0≤x≤1), and AENb(GaAl)SiO(where AE represents alkaline earth metal, 0≤x≤1).SELECTED DRAWING: Figure 1 【課題】所望とする性能が得られる状態で、ランガサイト型構造を有する酸化物結晶による圧電素子を、より小型化する。【解決手段】コイルバネ１０１とする圧電単結晶体は、圧電単結晶体は、ＲＥ3Ｇａ5-xＡｌxＳｉＯ14（式中ＲＥは希土類を表し、０≦ｘ≦５）、ＲＥ3Ｔａ0.5Ｇａ5.5-xＡｌxＯ14（式中ＲＥは希土類を表し、０＜ｘ≦５．５）、ＲＥ3Ｎｂ0.5Ｇａ5.5-xＡｌxＯ14（式中ＲＥは希土類を表し、０≦ｘ≦５．５）、ＡＥ3Ｔａ（Ｇａ1-xＡｌx）3Ｓｉ2Ｏ14（式中ＡＥはアルカリ土類金属を表し、０≦ｘ≦１）、およびＡＥ3Ｎｂ（Ｇａ1-xＡｌx）3Ｓｉ2Ｏ14（式中ＡＥはアルカリ土類金属を表し、０≦ｘ≦１）のいずれかからなる群に含まれる組成を有するランガサイト型構造の酸化物から構成されている。【選択図】 図１