JP4894908B2 - 誘電体磁器組成物 - Google Patents
誘電体磁器組成物 Download PDFInfo
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- JP4894908B2 JP4894908B2 JP2009262172A JP2009262172A JP4894908B2 JP 4894908 B2 JP4894908 B2 JP 4894908B2 JP 2009262172 A JP2009262172 A JP 2009262172A JP 2009262172 A JP2009262172 A JP 2009262172A JP 4894908 B2 JP4894908 B2 JP 4894908B2
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Description
任意に、MnO,Cr2O3,Co2O3からなる群から選ばれる一種以上の第1添加物0.01〜1.0モル%と、
任意に、{Baα,Ca(1−α)}SiO3(ただし、0≦α≦1)である第2添加物0.5〜10.0モル%とからなる誘電体磁器組成物が提案されている。
86.32〜97.64モル%のBaTiO3、0.01〜10.00モル%のY2O3、0.01〜10.00モル%のMgO、0.001〜0.200モルのV2O5からなる誘電体主成分と、
MnO,Cr2O3,Co2O3からなる群から選ばれる一種以上の第1添加物0.01〜1.0モル%と、
{Baα,Ca(1−α)}SiO3(ただし、0≦α≦1)である第2添加物0.5〜10.0モル%と、
BaTiO3100重量部に対し、
Sr:10〜500ppm
S:10〜50ppm
Al:10〜50ppm
Fe:10〜50ppm
Zr:100〜800ppm
Y:10〜100ppm
Hf:10〜100ppmを含むことを特徴としている。
BaTiO3、Y2O3、MgOおよびV2O5からなる誘電体主成分と、
MnO,Cr2O3,Co2O3からなる群から選ばれる一種以上の第1添加物と、
{Baα,Ca(1−α)}SiO3(ただし、0≦α≦1)である第2添加物と、
所定量のSr、S、Al、Fe、Zr、YおよびHfを含む。
BaTiO3は、86.32〜97.64モル%あり、
Y2O3は、0.01〜10.00モル%、好ましくは0.1〜5モル%、さらに好ましくは0.5〜3モル%であり、
MgOは、0.01〜10.00モル%、好ましくは0.1〜5モル%、さらに好ましくは0.5〜3モル%であり、
V2O5は、0.001〜0.200モル%、好ましくは0.005〜0.1モル%、さらに好ましくは0.01〜0.1モル%である。
Sr:10〜500ppm、好ましくは50〜500ppm
S:10〜50ppm、好ましくは10〜30ppm
Al:10〜50ppm、好ましくは10〜30ppm
Fe:10〜50ppm、好ましくは10〜30ppm
Zr:100〜800ppm、好ましくは300〜800ppm
Y:10〜100ppm、好ましくは10〜50ppm
Hf:10〜100ppm、好ましくは10〜50ppmである。
なお、微量成分としてのYの成分量には、主成分に含まれるY2O3由来のYの量は含まない。
S源となる化合物としては、硫酸ストロンチウム(SrSO4)があげられ、
Al源となる化合物としては、Al2O3があげられ、
Fe源となる化合物としては、Fe2O3があげられ、
Zr源となる化合物としては、ZrO2があげられ、
Y源となる化合物としては、Y2O3があげられ、
Hf源となる化合物としては、HfO2があげられる。また、これらの複合化合物であってもよい。
製造例で得た誘電体粉末の比表面積をBET法により求めた。具体的には、NOVA2200(高速比表面積計)を用い、紛量1g、窒素ガス、1点法 脱気条件300℃で15分保持、の条件で測定した。
製造例で得た誘電体粉末のX線回折分析によりK値、c/a値および残留した炭酸バリウム量を求めた。具体的には、BRUKER AXS社製、全自動多目的X線回折装置 D8 ADVANCEを用いて、Cu−Kα、40kV、40mA、2θ:20〜120degで測定し、1次元高速検出器LynxEye、発散スリット0.5deg、散乱スリット0.5degを用いた。また、スキャン:0.01〜0.02deg、スキャンスピード:0.3〜0.8s/divでスキャンした。解析には、Rietveld解析ソフト(Topas(BrukerAXS社製))を用いた。
実施例および比較例で作成した内部電極の積層数が4である積層セラミックコンデンサについて、比誘電率「εs」、誘電損失「tanδ」、絶縁抵抗「IR」静電容量の温度特性「T・C」および「推定故障率」の評価を行った。
(製造例)
二酸化チタンと、炭酸バリウムとを所定量秤量し、得られるチタン酸バリウム100重量部に対し、微量成分含量がSr400ppm、S30ppm、Al10ppm、Fe10ppm、Zr600ppm、Y80ppm、Hf20ppmとなるように原料化合物を準備した。
(1)焼成後の組成が表1に示す配合になるように誘電体粉末(BaTiO3基準)、Y2O3、MgO、V2O5、第1添加物(MnO,Cr2O3および/またはCo2O3)、第2添加物(BCG)を秤量して調合する。
(2)ドクターブレード法により、厚さ6μmでフィルム上に塗布し、グリーンシートを成形する。
(3)得られたグリーンシートに内部電極材料であるニッケルペーストを印刷により成形する。
(4)これを4層に積層し、さらに最上層にグリーンシートを積層し、熱圧着し積層体を得る。
(5)得られた積層体を、長さ3.2×1.6mmである3216形状に切断する。
(6)200℃〜300℃の温度で安定させて12時間脱バインダ処理を行う。
(7)酸素分圧を1×10-13〜5×10-9atmに制御し、焼成温度1200℃〜1300℃で安定させて2時間焼成する。
(8)中性雰囲気中で、酸素分圧を2×10-8〜5×10-6atmに制御し、800℃〜1100℃で安定させて2時間再酸化処理を行う。
(9)インジウム−ガリウム(In−Ga)合金の端子電極を取り付け、試料コンデンサを得る。
Claims (1)
- 86.32〜97.64モル%のBaTiO3、0.01〜10.00モル%のY2O3、0.01〜10.00モル%のMgO、0.001〜0.200モルのV2O5からなる誘電体主成分と、
MnO,Cr2O3,Co2O3からなる群から選ばれる一種以上の第1添加物0.01〜1.0モル%と、
{Baα,Ca(1−α)}SiO3(ただし、0≦α≦1)である第2添加物0.5〜10.0モル%と、
BaTiO3100重量部に対し、
Sr:10〜500ppm
S:10〜50ppm
Al:10〜50ppm
Fe:10〜50ppm
Zr:100〜800ppm
Y:10〜100ppm
Hf:10〜100ppmを含む誘電体磁器組成物。
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