JP5998765B2 - 誘電体磁器組成物およびこれを用いたセラミック電子部品 - Google Patents
誘電体磁器組成物およびこれを用いたセラミック電子部品 Download PDFInfo
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- JP5998765B2 JP5998765B2 JP2012194121A JP2012194121A JP5998765B2 JP 5998765 B2 JP5998765 B2 JP 5998765B2 JP 2012194121 A JP2012194121 A JP 2012194121A JP 2012194121 A JP2012194121 A JP 2012194121A JP 5998765 B2 JP5998765 B2 JP 5998765B2
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Description
図1に示すように、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コンデンサ素子本体10を有する。このコンデンサ素子本体10の両端部には、コンデンサ素子本体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。コンデンサ素子本体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、そ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、本実施形態に係る誘電体磁器組成物から構成される。該誘電体磁器組成物は、主成分として、一般式ABO3(AはBa単独、または、BaとCaおよびSrから選ばれる少なくとも1つとであり、BはTi単独、または、TiおよびZrである)で表される化合物と、副成分として、一般式R2Ti2O7で表される希土類チタン酸化物相からなる化合物(ただし、R元素は、Sc、Y、Eu、Gd、Tb、Dy、Ho、Er、Tm、YbおよびLuから選ばれる少なくとも1つ)と、を有している。なお、酸素(O)量は、化学量論組成から若干偏倚してもよい。
本実施形態では、上記の誘電体層2を構成する誘電体磁器組成物に含有される一般式R2Ti2O7で表される希土類チタン酸化物相からなる化合物はABO3で表される化合物とは独立した偏析相を形成してもよく、主成分(ABO3)の粒界層あるいは粒界三重点に存在してもよい。
図1に示す内部電極層3に含有される導電材は特に限定されないが、誘電体層2を構成する誘電体磁器組成物が耐還元性を有する場合、比較的安価な卑金属を用いることができる。導電材として用いる卑金属としては、NiまたはNi合金が好ましい。また、内部電極層3は、市販の電極用ペーストを使用して形成してもよい。内部電極層3の厚さは用途等に応じて適宜決定すればよい。
図1に示す外部電極4に含有される導電材は特に限定されないが、本実施形態では安価なNi,Cuや、これらの合金を用いることができる。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。
本実施形態に係る積層セラミックコンデンサ1は、従来の積層セラミックコンデンサと同様に、ペーストを用いた通常の印刷法やシート法によりグリーンチップを作製し、これを焼成した後、外部電極を印刷または転写して焼成することにより製造される。以下、製造方法について具体的に説明する。
まず、ABO3の原料としてBaTiO3 粉末を、副成分の原料として、Y2O3、MgCO3、MnCO3、V2O5、CaSiO3の各粉末とを、それぞれ準備した。また、MgCO3およびMnCO3 は、焼成後には、MgOおよびMnOとして誘電体磁器組成物中に含有されることとなる。
まず、得られたコンデンサ試料を粉砕し、X線回析法(Cu―Kα)により2θ=20〜100°の回析ピークから結晶相の同定をおこなった。次に、誘電体中のY2Ti2O7の割合をBaTiO3の面指数(110)のX線回析チャートのピーク強度を100とした場合のY2Ti2O7の面指数(222)におけるピーク強度の比を百分率として求めたものをY2Ti2O7の含有率とした。
比誘電率εは、コンデンサ試料に対し、基準温度25℃において、デジタルLCRメータ(YHP社製4274A)にて、周波数1kHz,入力信号レベル(測定電圧)1.0Vrmsの条件下で測定された静電容量から算出した(単位なし)。本実施例では、比誘電率は高いほうが好ましく、3500以上を良好とし、4000以上を特に良好とした。結果を表1に示す。
得られたコンデンサ試料から、FIBを用いて薄片試料を作成した。これを走査透過型電子顕微鏡(STEM)で観察し、隣接する結晶粒子を粒界とし、電子線に対して粒界が垂直になる厚みを計測した。このような粒界を10点探して、厚みを測定し、平均粒界厚みとした。
表2の試料番号19〜26は、実施例1の試料番号16と同様の組成でLi4Ti5O12の添加量のみ変化させた試料を実施例1と同様の工程を経て作成したもので、Y2Ti2O7の含有率と比誘電率との関係を評価した。試料番号27〜32は、実施例1の試料番号16と同様の組成で、SiO2の添加量のみ変化させた試料を実施例1と同様の工程を経て作成したもので、Y2Ti2O7の含有率と比誘電率との関係を評価した。なお、表2のLi4Ti5O12量とは主成分であるBaTiO3 100モルに対してLi原子換算で添加した量を示している。同様に、SiO2量とは主成分であるBaTiO3 100モルに対してSi原子換算で添加した量を示している。
なお、試料番号18の平均粒界厚みは、3.5nmであり、実施例1の試料に比較して、厚かった。
10… コンデンサ素子本体
2… 誘電体層
3… 内部電極層
4… 外部電極
Claims (2)
- 一般式ABO3(AはBaとCaおよびSrから選ばれる少なくとも1種の元素であり、BはTiおよびZrから選ばれる少なくとも1種の元素である)で表され、ペロブスカイト型結晶構造を有する化合物αと、一般式R2Ti2O7で表される希土類チタン酸化物からなる化合物β(ただし、R元素は、Sc、Y、Eu、Gd、Tb、Dy、Ho、Er、Tm、YbおよびLuから選ばれる少なくとも1種の元素である)と前記化合物αの粒子間に形成された粒界とを備え、
前記化合物αのX線回折チャートにおける面指数(110)のピーク強度に対して、前記化合物βのX線回折チャートにおける面指数(222)におけるピーク強度が0.5〜9.0%であることを特徴とする誘電体磁器組成物。 - 請求項1に記載の誘電体磁器組成物から構成される誘電体層と電極層とを有するセラミック電子部品。
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