JP2012066987A - 六方晶系チタン酸バリウム粉末、その製造方法、誘電体磁器組成物および電子部品 - Google Patents
六方晶系チタン酸バリウム粉末、その製造方法、誘電体磁器組成物および電子部品 Download PDFInfo
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- JP2012066987A JP2012066987A JP2010215754A JP2010215754A JP2012066987A JP 2012066987 A JP2012066987 A JP 2012066987A JP 2010215754 A JP2010215754 A JP 2010215754A JP 2010215754 A JP2010215754 A JP 2010215754A JP 2012066987 A JP2012066987 A JP 2012066987A
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- Prior art keywords
- barium titanate
- powder
- hexagonal
- titanate powder
- specific surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 229910002113 barium titanate Inorganic materials 0.000 title claims abstract description 101
- 239000000843 powder Substances 0.000 title claims abstract description 90
- 239000000203 mixture Substances 0.000 title claims description 25
- 239000000919 ceramic Substances 0.000 title claims description 16
- 238000000034 method Methods 0.000 title description 8
- 239000002245 particle Substances 0.000 claims abstract description 48
- 150000002500 ions Chemical class 0.000 claims description 22
- 239000010936 titanium Substances 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 11
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 10
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims description 8
- 229910021645 metal ion Inorganic materials 0.000 claims description 7
- 230000001186 cumulative effect Effects 0.000 claims description 6
- 239000011812 mixed powder Substances 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 239000004408 titanium dioxide Substances 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 229910052733 gallium Inorganic materials 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 30
- 238000010438 heat treatment Methods 0.000 description 23
- 239000002994 raw material Substances 0.000 description 21
- 239000003985 ceramic capacitor Substances 0.000 description 12
- 239000013078 crystal Substances 0.000 description 12
- 239000003990 capacitor Substances 0.000 description 11
- 150000001875 compounds Chemical class 0.000 description 10
- 238000002441 X-ray diffraction Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 6
- 238000010298 pulverizing process Methods 0.000 description 6
- 239000010419 fine particle Substances 0.000 description 5
- 229910010413 TiO 2 Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000004438 BET method Methods 0.000 description 3
- 229910005191 Ga 2 O 3 Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 229910052788 barium Inorganic materials 0.000 description 3
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910003077 Ti−O Inorganic materials 0.000 description 2
- 239000010953 base metal Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052689 Holmium Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910006404 SnO 2 Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
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- C01G23/003—Titanates
- C01G23/006—Alkaline earth titanates
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Abstract
【解決手段】本発明に係る六方晶系チタン酸バリウム粉末は、最大粒径が1.0μm以下であり、90%累積粒子径(D90)と50%累積粒子径(D50)との比(D90/D50)が3.0以下であり、六方晶化率が50%以上であることを特徴としている。
【選択図】なし
Description
(1)最大粒径が1.0μm以下であり、
90%累積粒子径(D90)と50%累積粒子径(D50)との比(D90/D50)が3.0以下であり、
六方晶化率が50%以上である六方晶系チタン酸バリウム粉末。
Mは、有効イオン半径が0.58〜0.64Åの+3価の金属イオンであり、
A/Bが0.900〜1.040の範囲にあり、
αが0.03〜0.2の範囲にある、(1)に記載の六方晶系チタン酸バリウム粉末。
比表面積が30m2/g以上の二酸化チタン粉末、および
比表面積が5.0m2/g以上のM元素含有粉末(Mは+3価イオンの有効イオン半径が0.58〜0.64Åである元素)を含む混合粉末を準備する工程、および、
該混合粉末を900℃以上1300℃未満で熱処理する工程を含む六方晶系チタン酸バリウム粉末の製造方法。
図1に示すように、電子部品の代表例であ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、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。
本実施形態に係る六方晶系チタン酸バリウム粉末は、六方晶構造を有するチタン酸バリウム(六方晶チタン酸バリウム)粉末を主成分としている。具体的には、本実施形態に係る六方晶系チタン酸バリウム粉末100質量%に対して、50質量%以上、好ましくは90質量%以上、より好ましくは95質量%以上の比率で六方晶チタン酸バリウムが含有されている。
次に、本実施形態に係る六方晶系チタン酸バリウム粉末を製造する方法について説明するが、本発明の六方晶系チタン酸バリウム粉末は下記製法により得られるものに限定はされない。
このようにして得られる六方晶系チタン酸バリウム粉末と下記副成分とを用いて焼結することで、電子部品等における誘電体層を形成する誘電体磁器組成物が得られる。
副成分としては、たとえば、
MgO、CaOおよびBaOからなる群から選ばれる少なくとも1つのアルカリ土類酸化物、
金属酸化物として、Mn3O4および/またはCr2O3と、CuOと、Al2O3と、
Y、La、Ce、Pr、Nd、Sm、Gd、Tb、Dy、HoおよびYbからなる群から選ばれる少なくとも1つの希土類元素の酸化物、および
SiO2を含むガラス成分が用いられる。
図1に示した、電子部品の代表例である積層セラミックコンデンサ1における誘電体層2の厚さは、特に限定されないが、一層あたり5μm以下であることが好ましく、より好ましくは3μm以下である。厚さの下限は、特に限定されないが、たとえば1μm程度である。本実施形態に係る誘電体磁器組成物によれば、層厚1μm以上で比誘電率が50以上を示す。誘電体層2の積層数は、特に限定されないが、200以上であることが好ましい。
原料粉末および熱処理後の生成物の比表面積はBET法により測定した。
熱処理後の生成物の粒子性状を、SEMにより1000個の粒子について観察測定し、各粒子の円相当換算径から、最大粒径、D50およびD90を算出した。
熱処理後の生成物の六方晶化率をX線回折分析により算出した。X線回折は、X線源としてCu−Kα線を用い、その測定条件は、電圧45kV、電流40mAで、2θ=20°〜90°の範囲を、走査速度4.0deg/min、積算時間30secであった。
BaCO3(比表面積:25m2/g)およびTiO2(比表面積:50m2/g)を準備した。また、M元素含有化合物として、Mn3O4(比表面積:20m2/g)、Cr2O3(比表面積:10m2/g)、Ga2O3(比表面積:10m2/g)、Co2O3(比表面積:10m2/g)、MgO(比表面積:20m2/g)、Al2O3(比表面積:20m2/g)、Fe2O3(比表面積:10m2/g)、In2O3(比表面積:10m2/g)、Ge2O3(比表面積:10m2/g)、SnO2(比表面積:10m2/g)を準備した。
原料粉末として、BaCO3(比表面積:5m2/g)、TiO2(比表面積:10m2/g)、Ga2O3(比表面積:5m2/g)を用い、還元雰囲気での熱処理を行った以外は、実施例と同様の操作を行った。結果を表1に示す。
2…誘電体層
3…内部電極層
4…外部電極
10…コンデンサ素子本体
Claims (6)
- 最大粒径が1.0μm以下であり、
90%累積粒子径(D90)と50%累積粒子径(D50)との比(D90/D50)が3.0以下であり、
六方晶化率が50%以上である六方晶系チタン酸バリウム粉末。 - BaA(Ti1−αMα)BO3で表され、
Mは、有効イオン半径が0.58〜0.64Åの+3価の金属イオンであり、
A/Bが0.900〜1.040の範囲にあり、
αが0.03〜0.2の範囲にある、請求項1に記載の六方晶系チタン酸バリウム粉末。 - Mが、Mn、Cr、GaおよびCoからなる群から選らばれる元素の+3価金属イオンである請求項2に記載の六方晶系チタン酸バリウム粉末。
- 請求項1〜3の何れかに記載のチタン酸バリウム粉末の焼結体を主成分とする誘電体磁器組成物。
- 請求項4に記載の誘電体磁器組成物で構成してある誘電体層と、内部電極層を有する電子部品。
- 比表面積が20m2/g以上の炭酸バリウム粉末、
比表面積が30m2/g以上の二酸化チタン粉末、および
比表面積が5.0m2/g以上のM元素含有粉末(Mは+3価イオンの有効イオン半径が0.58〜0.64Åである元素)を含む混合粉末を準備する工程、および、
該混合粉末を900℃以上1300℃未満で熱処理する工程を含む六方晶系チタン酸バリウム粉末の製造方法。
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JP2010215754A JP5655466B2 (ja) | 2010-09-27 | 2010-09-27 | 六方晶系チタン酸バリウム粉末、その製造方法、誘電体磁器組成物および電子部品 |
US13/226,140 US8545982B2 (en) | 2010-09-27 | 2011-09-06 | Hexagonal type barium titanate powder, producing method thereof, dielectric ceramic composition and electronic component |
DE102011083194A DE102011083194A1 (de) | 2010-09-27 | 2011-09-22 | Bariumtitanatpulver vom hexagonalen Typ, Erzeugungsverfahren hierfür, dielektrische Keramikzusammensetzung und elektronische Komponente |
CN201110295565.3A CN102557616B (zh) | 2010-09-27 | 2011-09-27 | 六方晶系钛酸钡粉末、其制造方法、电介质陶瓷组合物及电子部件 |
KR1020110097356A KR101310068B1 (ko) | 2010-09-27 | 2011-09-27 | 육방정계 티탄산바륨 분말, 그 제조 방법, 유전체 자기 조성물 및 전자 부품 |
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JP3669624B2 (ja) * | 1998-05-20 | 2005-07-13 | 東邦チタニウム株式会社 | チタン酸バリウム粉末の製造方法 |
JP2002234769A (ja) * | 2001-02-01 | 2002-08-23 | Murata Mfg Co Ltd | チタン酸バリウム粉末の製造方法、チタン酸バリウム粉末、誘電体セラミックおよび積層セラミックコンデンサ |
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JP4658689B2 (ja) | 2005-05-27 | 2011-03-23 | 京セラ株式会社 | チタン酸バリウム粉末の製法およびチタン酸バリウム粉末、並びにチタン酸バリウム焼結体 |
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US20120077036A1 (en) | 2012-03-29 |
CN102557616A (zh) | 2012-07-11 |
DE102011083194A1 (de) | 2012-03-29 |
JP5655466B2 (ja) | 2015-01-21 |
KR101310068B1 (ko) | 2013-09-24 |
KR20120031918A (ko) | 2012-04-04 |
US8545982B2 (en) | 2013-10-01 |
CN102557616B (zh) | 2014-06-25 |
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