ELECTRET

• Main Authors: MARUYAMA TOMOYA, KOZAWA YOSHIHIRO, KANO KAZUHIKO, OKAMOTO YUJI, MATSUSHITA NORIYUKI, SAIKI KATSUYOSHI, TANAKA YUMI, MORIOKA NAOYA
• Format: Patent
• Language: English; Japanese
• Published: 24.06.2021
• Subjects: ARTIFICIAL STONE; BASIC ELECTRIC ELEMENTS; CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES ORLIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; ELECTRICITY; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

To provide an electret that has excellent thermal stability, can control the amount of crystal defects, and has stable characteristics in an usage environment.SOLUTION: An electret 1 is formed by polarization treatment of a composite oxide having an ABO3 type perovskite structure containing two different metal elements A and B. In the composite oxide, at least one of the metal elements A and B is partially replaced with a dopant element having a lower valence than the metal elements A and B, and the bandgap energy is 4. eV or higher.SELECTED DRAWING: Figure 1 【課題】熱的安定性に優れ、結晶欠陥量の制御が可能であり、使用環境で安定した特性を有するエレクトレットを提供する。【解決手段】エレクトレット１は、異なる２種の金属元素Ａ、Ｂを含むＡＢＯ3型のペロブスカイト構造を有する複合酸化物を分極処理してなる。複合酸化物は、金属元素Ａ、Ｂのうちの少なくとも１つについて、その一部が、金属元素Ａ、Ｂよりも低価数のドーパント元素にて置換されており、かつ、バンドギャップエネルギが４ｅＶ以上である。【選択図】図１