JP5668569B2 - 誘電体磁器組成物および電子部品 - Google Patents
誘電体磁器組成物および電子部品 Download PDFInfo
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- 239000000203 mixture Substances 0.000 title claims description 57
- 229910052573 porcelain Inorganic materials 0.000 title 1
- 239000000919 ceramic Substances 0.000 claims description 34
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical group [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- 229910052684 Cerium Inorganic materials 0.000 claims description 7
- 229910052748 manganese Inorganic materials 0.000 claims description 7
- 229910052779 Neodymium Inorganic materials 0.000 claims description 6
- 229910052772 Samarium Inorganic materials 0.000 claims description 6
- 229910052746 lanthanum Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 229910052727 yttrium Inorganic materials 0.000 claims description 6
- 239000011787 zinc oxide Substances 0.000 claims description 5
- 239000003989 dielectric material Substances 0.000 claims 2
- 239000003985 ceramic capacitor Substances 0.000 description 23
- 230000005684 electric field Effects 0.000 description 19
- 230000015556 catabolic process Effects 0.000 description 17
- 239000003990 capacitor Substances 0.000 description 15
- 239000002994 raw material Substances 0.000 description 11
- 239000000843 powder Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 238000001354 calcination Methods 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000004679 hydroxides Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 238000010532 solid phase synthesis reaction Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- 229910001316 Ag alloy Inorganic materials 0.000 description 1
- 229910000807 Ga alloy Inorganic materials 0.000 description 1
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000002003 electrode paste Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
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Description
(Bax Biy )TiO3 の組成式で表わされる主成分と、第1副成分と、第2副成分と、を有する誘電体磁器組成物であって、
前記組成式中のyが0.001≦y≦0.010であり、かつ、前記組成式中のxとyの合計が0.975≦x+y≦1.010であり、
前記第1副成分は、酸化亜鉛であり、
前記第2副成分は、Y、La、Ce、Nd、Sm、MnおよびNiから選ばれる少なくとも1種の酸化物であり、
前記第1副成分は前記主成分100重量部に対して2重量部以上12重量部以下含有されており、
前記第2副成分は前記主成分100重量部に対して酸化物換算で0.008重量部以上0.08重量部以下含有されている誘電体磁器組成物である。
図1(A)、図1(B)に示すように、本発明の実施形態に係るセラミックコンデンサ2は、誘電体層10と、その対向表面に形成された一対の端子電極12,14と、この端子電極12,14に、それぞれ接続されたリード端子6,8とを有する構成となっており、これらは保護樹脂4に覆われている。
誘電体層10は、本発明の実施形態に係る誘電体磁器組成物により構成される。
端子電極12,14は、導電材で構成される。端子電極12,14に用いられる導電材としては、たとえば、Cu、Cu合金、Ag、Ag合金、In−Ga合金等が挙げられる。なお、従来は、端子電極の導電材にCuまたはCu合金を用いる場合、端子電極の焼付けを還元性雰囲気中で行う必要があるため、誘電体磁器組成物が半導体化する可能性があった。しかし、本発明の実施形態に係る誘電体磁器組成物は、耐還元性が良好であるため、端子電極にCuまたはCu合金を使用しても、焼付けの際の誘電体磁器組成物の半導体化を防ぐことができる。
次に、セラミックコンデンサの製造方法について説明する。
まず、焼成後に図1に示す誘電体層10を形成することとなる誘電体磁器組成物粉末を製造する。
主成分の原料として、BaCO3 、Bi2 O3 TiO2 および第2副成分を、それぞれ準備した。そして、準備したこれらの原料を、表1の試料1〜40に示す組成となるように、それぞれ秤量し、溶媒として純水を用いたジルコニアボールによるボールミルにより湿式混合した。
交流破壊電界(ACVB)は、コンデンサの試料に対し、コンデンサの両端に交流電界を100V/sで徐々に印加し、100mAのもれ電流が流れた時点での電界値を交流破壊電界として測定した。交流破壊電界は高いほうが好ましく、本実施例では、6.0kV/mm以上を良好とした。
比誘電率εは、コンデンサ試料に対し、基準温度20℃において、デジタルLCRメータ(アジレントテクノロジー社製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)。比誘電率は高いほうが好ましく、本実施例では、1500以上を良好とした。
Ag電極を有するコンデンサ試料の誘電損失とCu電極を有するコンデンサ試料の誘電損失とを、それぞれ基準温度20℃において、デジタルLCRメータ(アジレントテクノロジー社製4274A)にて、周波数1kHz,入力信号レベル(測定電圧)1.0Vrmsの条件下で測定した。
|tanδ(Cu)−tanδ(Ag)|・・・(1)
誘電損失の変化量の絶対値は耐還元性の指標となり、数値が小さいほど耐還元性が良好であることを意味する。本実施例では0.7以下を良好とした。
コンデンサ試料に対して、−25℃〜85℃の温度範囲で静電容量を測定し、20℃での静電容量に対する−25℃および85℃での静電容量の変化率(単位は%)を算出した。本実施例では、静電容量変化率が−15%〜15%の間にあるものを良好とした。
Claims (2)
- (Bax Biy )TiO3 の組成式で表わされる主成分と、第1副成分と、第2副成分と、を有する誘電体磁器組成物であって、
前記組成式中のyが0.001≦y≦0.008であり、かつ、前記組成式中のxとyの合計が0.975≦x+y≦1.010であり、
前記第1副成分は、酸化亜鉛であり、
前記第2副成分は、Y、La、Ce、Nd、Sm、MnおよびNiから選ばれる少なくとも1種の酸化物であり、
前記第1副成分が前記主成分100重量部に対して2重量部以上12重量部以下含有されており、
前記第2副成分は前記主成分100重量部に対して酸化物換算で0.008重量部以上0.08重量部以下含有されてい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で構成してある誘電体層を有する電子部品。
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JP2011070633A JP5668569B2 (ja) | 2011-03-28 | 2011-03-28 | 誘電体磁器組成物および電子部品 |
TW101107823A TWI476170B (zh) | 2011-03-28 | 2012-03-08 | Dielectric ceramic compositions and electronic components |
KR1020120029840A KR101279081B1 (ko) | 2011-03-28 | 2012-03-23 | 유전체 자기 조성물 및 전자 부품 |
CN2012101003328A CN102718478A (zh) | 2011-03-28 | 2012-03-28 | 电介质陶瓷组合物及电子部件 |
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JPS594803B2 (ja) * | 1974-12-27 | 1984-02-01 | 松下電器産業株式会社 | 高誘電率磁器 |
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US6107227A (en) * | 1998-08-03 | 2000-08-22 | Cts Corporation | Barium neodymium titanate dielectric ceramic composition incorporating samarium oxide for improved electrical performance |
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