PROCESS FOR PRODUCING SINGLE CRYSTAL OF POTASSIUM NIOBATE

• Main Authors: TAKEMURA, SHUJI, YAMADA, KAZUHIRO, MORI, HIROSHI
• Format: Patent
• Language: English; Korean
• Published: 25.04.1998
• Edition: 6
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR; CHEMISTRY; CRYSTAL GROWTH; 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

본 발명에 의하면 포타시움 니오베이트의 단결정의 한 C-평면상에 반절연물질층을 통해 또는 직접 양전극을 그리고 포타시움 니오베이트의 단결정의 다른 C-평면상에 반절연물질층을 통해 음전극을 배치하는 단계를 포함하며, 상기 양전극과 음전극은 서로 대향배치되며, 포타시움 니오베이트의 단결정을 폴링하여 싱글도메인상태로 반전시키도록 양전극과 음전극간에 전압을 걸어서 품질저하없이 포타시움 니오베이트의 단결정의 전 영역을 폴링하는 단계를 포함하는 포타시움 니오베이트의 단결정을 제조하는 방법이 제공된다. There has been provided by the present invention a process for producing a single crystal of potassium niobate which comprises disposing a positive electrode directly or via a semi-insulating substance layer on one c-plane of a single crystal of potassium niobate and also a negative electrode via a semi-insulating substance layer on the other c-plane of the single crystal of potassium niobate, said positive and negative electrodes being disposed in mutually facing relationship, and applying voltage between the positive and negative electrodes so as to poll (convert to the single-domain state) the single crystal of potassium niobate, and which enables to poll the entire region of the single crystal of potassium niobate without quality deterioration.