JP5855159B2 - 高誘電率と低誘電損失特性を持つニオブ酸ビスマス誘電体組成物 - Google Patents
高誘電率と低誘電損失特性を持つニオブ酸ビスマス誘電体組成物 Download PDFInfo
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- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/495—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1254—Ceramic dielectrics characterised by the ceramic dielectric material based on niobium or tungsteen, tantalum oxides or niobates, tantalates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/30—Stacked capacitors
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
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- Inorganic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Ceramic Capacitors (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Formation Of Insulating Films (AREA)
- Semiconductor Memories (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Description
本研究は、梨花女子大学産学協力団(参加機関:韓国科学技術研究院)の主管下で 韓国産業通商資源部の部品・素材産業の競争力向上(素材・部品の技術開発)事業(課題名:誘電率400以上を有する誘電体無機ナノシートの合成技術及びこれを用いたMLCC素子用高誘電体の薄膜製造技術開発、課題固有番号:1415125378)の支援によって行われたものである。
また、本発明は、ナノレベルの薄膜でも線形で且つ優れた誘電率を有し絶縁特性を実現することができる低温素子の製作に応用可能なナノシート形態の誘電物質を提供することを他の目的とする。
本発明の目的を達成するためのまた他の一具現例において、前記ニオブ酸ビスマス誘電体組成物を含む積層セラミックコンデンサを提供する。
本発明の目的を達成するためのまた他の一具現例において、前記ニオブ酸ビスマス誘電体組成物を含むマイクロ波誘電体を提供する。
本発明の目的を達成するためのまた他の一具現例において、前記ニオブ酸ビスマス誘電体組成物を含むコンピュータ用DRAMメモリを提供する。
本発明に係る高誘電率と低誘電損失特性を持つニオブ酸ビスマス誘電体組成物は、高い誘電率と良好な絶縁特性を持つので、積層セラミックコンデンサ、マイクロ波誘電体、次世代TFTの誘電膜などに活用できる。
また、本発明に係る高誘電率と低誘電損失特性を持つニオブ酸ビスマス誘電体組成物は、次世代デバイスに適用可能なナノレベルのMLCCに機能性誘電薄膜として応用できる。
本発明は、一般式KSr2(1-x)Bi(y/3)xNb3O10+δ(KSBNO)、HSr2(1−x)Bi(y/3)xNb3O10+δ(HSBNO)、Sr2(1−x)Bi(y/3)xNb3O10+δ(SBNO)で示される(ここで、全ての組成のモル分率xは0<x≦0.3、yは4≦y≦6、δは0≦x≦0.3の範囲である。)誘電体組成物に関するものであって、組成の変化により高い誘電特性を持つKSBNO誘電体組成物を合成する。また、前記KSBNO誘電体組成物を基盤にH+イオンを用いたK+イオンの置換を通じてKSBNOが持つ非線形誘電特性を線形誘電特性に変化させ且つ誘電損失を減少させることで、高い誘電率、低い誘電損失、線形誘電特性を持つHSBNO誘電体組成物を合成する。また、前記HSBNO誘電体組成物のH+イオンをTBA+イオンに置換し剥離することでSBNO誘電体組成物を製造する。
KSr2(1−x)Bi(y/3)xNb3O10+δ (KSBNO)
(前記化学式1中、モル分率xは0<x≦0.3、yは4≦y≦6、δは0≦x≦0.3の範囲である。)
HSr2(1−x)Bi(y/3)xNb3O10+δ (HSBNO)
(前記化学式2中、モル分率xは0<x≦0.3、yは4≦y≦6、δは0≦x≦0.3の範囲である。)
Sr2(1-x)Bi(y/3)xNb3O10+δ (SBNO)
(前記化学式3中、モル分率xは0<x≦0.3、yは4≦y≦6、δは0≦x≦0.3の範囲である。)
以下、実施例を通じて本発明をより詳しく説明することにする。これらの実施例は、専ら本発明を例示するためのものに過ぎず、本発明の範囲がこれらの実施例によって制限されるものではないことは当業界における通常の知識を有する者には自明なことである。
次いで、本発明の実施形態について詳述する。本発明における誘電体セラミックは、KSr2Nb3O10で示される主成分のSrサイトをBiに置換して、KSr2(1−x)Bi(y/3)xNb3O10+δ(KSBNO)で示される(ここで、モル分率xは0<x≦0.3、yは4≦y≦6の範囲)組成式を満足する物質、Sr2(1−x)Bi(y/3)xNb3O10+δ層の間に一層ずつ存在しているK+イオン層を酸溶液にてH+イオン置換して、HSr2(1−x)Bi(y/3)xNb3O10+δ(HSBNO)で示される(ここで、モル分率xは0<x≦0.3、yは4≦y≦6、δは0≦x≦0.3の範囲)組成式を満足する物質である。
図3は本発明に係る誘電体セラミック物質の走査電子顕微鏡による写真であって、同写真から層状構造を有していることが確認でき且つ板状の粒子を形成したことが示されている。
次いで、実施例1で得られたHSr2(1−x)Bi2xNb3O10+δセラミック物質を利用し、H+:TBA+=1:1の比でテトラブチルアンモニウム水酸化物を添加して室温で7日間撹拌反応させ、組成式Ca2(1−x)Sr2xNb3O10+δで示されるペロブスカイトナノシートが分散された不透明のコロイド溶液を製作した。
次いで、合成が実施されたセラミックス組成物は、KSr2(1−x)Bi(4/3)xNb3O10で示される(ここで、モル分率xは0<x≦0.3の範囲である。)化学量論的組成式を満足する物質、Sr2(1−x)Bi(4/3)xNb3O10層の間に一層ずつ存在しているK+イオン層を酸溶液にてH+イオン置換することでHSr2(1−x)Bi(4/3)xNb3O10で示される(ここで、モル分率xは0<x≦0.3の範囲である。)組成式を満足する物質である。
Claims (7)
- 下記の化学式1で示される組成を有する高誘電率と低誘電損失特性を持つニオブ酸ビスマス誘電体組成物。
KSr2(1−x)Bi(y/3)xNb3O10 ・・・(化学式1)
(前記化学式1中、モル分率xは0<x≦0.3、yは4≦y≦6の範囲である。) - 下記の化学式2で示される組成を有する高誘電率と低誘電損失特性を持つニオブ酸ビスマス誘電体組成物。
HSr2(1−x)Bi(y/3)xNb3O10 ・・・(化学式2)
(前記化学式2中、モル分率xは0<x≦0.3、yは4≦y≦6の範囲である。) - 下記の化学式3で示される組成を有する高誘電率と低誘電損失特性を持つニオブ酸ビスマス誘電体組成物。
Sr2(1−x)Bi(y/3)xNb3O10 ・・・(化学式3)
(前記化学式3中、モル分率xは0<x≦0.3、yは4≦y≦6の範囲である。) - 請求項1〜3のいずれか一項に記載のニオブ酸ビスマス誘電体組成物を含むナノシート薄膜。
- 請求項1〜3のいずれか一項に記載のニオブ酸ビスマス誘電体組成物を含む積層セラミックコンデンサ。
- 請求項1〜3のいずれか一項に記載のニオブ酸ビスマス誘電体組成物を含むマイクロ波誘電体。
- 請求項1〜3のいずれか一項に記載のニオブ酸ビスマス誘電体組成物を含むコンピュータ用DRAMメモリ。
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