JP2022122145A - 誘電体組成物、電子部品および積層電子部品 - Google Patents
誘電体組成物、電子部品および積層電子部品 Download PDFInfo
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Abstract
Description
主相粒子と偏析粒子とを含み、前記主相粒子が一般式ABO3で表されるペロブスカイト型結晶構造を有する主成分を含む誘電体組成物であって、
前記誘電体組成物は、RA、RB、MおよびSiを含み、
AはBa、SrおよびCaから選択される少なくとも1種、
BはTi、ZrおよびHfから選択される少なくとも1種、
RAはEu、Gd、TbおよびDyから選択される少なくとも1種、
RBはY、HoおよびYbから選択される少なくとも1種、
MはMg、Mn、VおよびCrから選択される少なくとも1種であり、
前記主成分に対するRAの含有量CRAがRA2O3換算で0.60モル%以上2.40モル%以下、
前記主成分に対するRBの含有量CRBがRB2O3換算で0.30モル%以上1.20モル%以下、
前記主成分に対するMの含有量がMO換算で0.20モル%以上1.00モル%以下、
前記主成分に対するSiの含有量がSiO2換算で0.60モル%以上1.80モル%以下であり、
前記偏析粒子のうちRA、RB、Si、BaおよびTiを主に含む特定偏析粒子におけるRAの平均含有量をαモル%、RBの平均含有量をβモル%とした場合に、
0.50<(α/β)/(CRA/CRB)≦1.00
である。
1.1 積層セラミックコンデンサの全体構成
本実施形態に係る積層電子部品の一例としての積層セラミックコンデンサ1が図1Aおよび図1Bに示される。積層セラミックコンデンサ1は、誘電体層2と、内部電極層3と、が交互に積層された構成の素子本体10を有する。この素子本体10の両端部には、素子本体10の内部で交互に配置された内部電極層3と各々導通する一対の外部電極4が形成してある。素子本体10の形状に特に制限はないが、通常、直方体状とされる。また、素子本体10の寸法にも特に制限はなく、用途に応じて適当な寸法とすればよい。
誘電体層2は、後述する本実施形態に係る誘電体組成物から構成されている。
本実施形態では、内部電極層3は、各端部が素子本体10の対向する2端面の表面に交互に露出するように積層してある。
外部電極4に含有される導電材は特に限定されない。たとえばNi、Cu、Sn、Ag、Pd、Pt、Auあるいはこれらの合金、導電性樹脂等公知の導電材を用いればよい。外部電極4の厚さは用途等に応じて適宜決定すればよい。
図2は本実施形態に係る誘電体層2を構成する誘電体組成物の模式図である。図2に示すように、本実施形態に係る誘電体層2を構成する誘電体組成物は、主相粒子14の間に偏析粒子16を含む。そして、偏析粒子16の少なくとも一部が後述する特定偏析粒子16aである。また、誘電体組成物は誘電体磁器組成物であってもよい。
本実施形態の主相粒子14はABO3で表されるペロブスカイト型結晶構造を有する化合物を主成分として含む。なお、主相粒子14の主成分とは、主相粒子100質量部に対して、80~100質量部を占める成分であり、好ましくは、90~100質量部を占める成分である。なお、主相粒子14が上記の主成分以外の成分を含有してもよい。例えばバリウム(Ba)化合物などを含有してもよい。
偏析粒子16の組成には特に制限はない。誘電体組成物2は、偏析粒子16として、RA、RB、Si、BaおよびTiを主に含む特定偏析粒子16aを含む。なお、「RA、RB、Si、BaおよびTiを主に含む」とは、RAおよびRBの合計含有量が3.0モル%以上、Siの含有量が1.0モル%以上であり、Baの含有量がTiの含有量よりも多く、かつ、O以外の元素の合計含有量に対するRA、RB、Si、BaおよびTiの合計含有量が80モル%以上である偏析粒子である。なお、RAの含有量が2.0モル%以上であってもよく、RBの含有量が1.0モル%以上であってもよい。
次に、図1Aに示す積層セラミックコンデンサ1の製造方法の一例について以下に説明する。
上述した実施形態では、本発明に係る電子部品が積層セラミックコンデンサである場合について説明したが、本発明に係る電子部品は、積層セラミックコンデンサに限定されず、上述した誘電体組成物を有する電子部品であればよい。
まず、後述する実施例15、16以外の実験例では、原料粉末として、BaTiO3粉末(Ba/Ti=1.004)、RA2O3粉末、RB2O3粉末、SiO2粉末、MgO粉末、MnCO3粉末、およびBaCO3粉末を準備した。そして、表1~表3に示す各実施例および比較例の組成である誘電体組成物が得られるように秤量した。表1~表3に示す組成は主成分であるBaTiO3の含有量を100モル%とした場合の組成である。表2に記載した各実施例はRAの種類およびRBの種類以外は実施例2と同一の組成である。BaCO3粉末は全ての実験例で主成分に対してBaO換算で0.7モル%となるようにした。なお、Mとして含まれるMgおよびMnについては、原子数比でMg:Mn=4:3となるようにした。
Ni粉末、テルピネオール、エチルセルロースおよびベンゾトリアゾールを、質量比が44.6:52.0:3.0:0.4となるように準備した。そして、これらを3本ロールにより混練し、ペースト化して内部電極層用ペーストを作製した。
上記の誘電体層用ペーストを用いてPETフィルム上にグリーンシートを形成した。グリーンシートの厚みは、乾燥後の厚みが4.0~5.0μmとなるようにした。次に、グリーンシートの上に内部電極層用ペーストを用いて、電極層を所定パターンで印刷した。その後、PETフィルムからグリーンシートを剥離することで、電極層を有するグリーンシートを作製した。次いで、電極層を有するグリーンシートを複数枚積層し、加圧接着することによりグリーン積層体を得た。このグリーン積層体を所定のサイズに切断することにより、グリーンチップを作製した。
次いで、得られたグリーンチップについて、脱バインダ処理、焼成および酸化処理を行い、焼結体である素子本体を得た。
次いで、得られた素子本体の端面をバレル研磨した後、外部電極としてCuペーストを塗布し、還元雰囲気にて焼付け処理を行い、図1Aに示す積層セラミックコンデンサの試料を得た。得られたコンデンサ試料のサイズは、3.2mm×1.6mm×0.7mmであり、誘電体層の厚みが3.2~4.2μm、内部電極層の厚みが0.8~1.2μmであった。また、誘電体層の数は10層とした。
得られた積層セラミックコンデンサ試料を、誘電体層に垂直な方向の断面(積層方向の断面)で切断した。得られた断面のうち、偏析相の有無を判定する箇所について、STEM-EDSマッピング分析を行った。5層以上の内部電極層が観察される大きさの視野において、得られたマッピング画像を0.027μm/pixelのドットに分割し、個々のドットでの各元素のコントラスト強度を数値化した。具体的にはコントラスト強度が最も小さいもの(検出なし)を0とし、最も大きいものを90として、コントラスト強度を0~90までの91段階に分類した。希土類元素のコントラスト強度が75以上のドットは希土類元素が偏析しているドットとした。希土類元素が偏析しているドットが集まっている部分が偏析粒子であるとした。
比誘電率は、積層セラミックコンデンサ試料に対し、デジタルLCRメータ(YHP社製4274A)を用いて測定した。具体的には、150℃で1時間熱処理して24時間後の静電容量を測定した。測定条件は基準温度25℃、周波数1.0kHz、入力信号レベル(測定電圧)1.0Vrmsとした。静電容量から比誘電率を算出した。比誘電率は2200以上を良好とした。
10… 素子本体
2… 誘電体層
14… 主相粒子
16… 偏析粒子
16a… 特定偏析粒子
16b… (特定偏析粒子以外の)偏析粒子
3… 内部電極層
4… 外部電極
Claims (4)
- 主相粒子と偏析粒子とを含み、前記主相粒子が一般式ABO3で表されるペロブスカイト型結晶構造を有する主成分を含む誘電体組成物であって、
前記誘電体組成物は、RA、RB、MおよびSiを含み、
AはBa、SrおよびCaから選択される少なくとも1種、
BはTi、ZrおよびHfから選択される少なくとも1種、
RAはEu、Gd、TbおよびDyから選択される少なくとも1種、
RBはY、HoおよびYbから選択される少なくとも1種、
MはMg、Mn、VおよびCrから選択される少なくとも1種であり、
前記主成分に対するRAの含有量CRAがRA2O3換算で0.60モル%以上2.40モル%以下、
前記主成分に対するRBの含有量CRBがRB2O3換算で0.30モル%以上1.20モル%以下、
前記主成分に対するMの含有量がMO換算で0.20モル%以上1.00モル%以下、
前記主成分に対するSiの含有量がSiO2換算で0.60モル%以上1.80モル%以下であり、
前記偏析粒子のうちRA、RB、Si、BaおよびTiを主に含む特定偏析粒子におけるRAの平均含有量をαモル%、RBの平均含有量をβモル%とした場合に、
0.50<(α/β)/(CRA/CRB)≦1.00
である誘電体組成物。 - 前記誘電体組成物の断面において、前記偏析粒子の合計面積に対する前記特定偏析粒子の合計面積の割合が80%以上である請求項1に記載の誘電体組成物。
- 請求項1または2に記載の誘電体組成物を有する電子部品。
- 請求項1または2に記載の誘電体組成物からなる誘電体層と、電極層と、が交互に積層されてなる積層電子部品。
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