KR102847109B1 - 유전체, 그 제조방법, 및 이를 포함하는 디바이스 - Google Patents
유전체, 그 제조방법, 및 이를 포함하는 디바이스Info
- Publication number
- KR102847109B1 KR102847109B1 KR1020210013468A KR20210013468A KR102847109B1 KR 102847109 B1 KR102847109 B1 KR 102847109B1 KR 1020210013468 A KR1020210013468 A KR 1020210013468A KR 20210013468 A KR20210013468 A KR 20210013468A KR 102847109 B1 KR102847109 B1 KR 102847109B1
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- dielectric
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- xca
- xba
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Abstract
[화학식 1]
xABO3-(1-x)(BiaNab)TiO3
상기 식중, A는 란탄족 원소, 희토류 원소 및 알칼리토금속 원소로부터 선택되는 적어도 하나의 원소이고,
B는 전이금속 원소로부터 선택되는 적어도 하나의 원소이고,
0.1<x<0.5, 0<a<1, 0<b<1, a+b=1이다.
Description
도 2는 실시예 2 및 4, 및 비교예 2 및 3의 유전체에 있어서, 온도에 따른 유전율 변화를 나타낸 것이다.
도 3은 실시예 2, 6, 7, 8 및 비교예 1에서 제조한 유전체의 X선 회절 패턴 측정 결과를 나타낸 것이다.
도 4는 실시예 1 내지 4 및 비교예 1 내지 3의 유전체에 있어서, 고전계 특성을 평가한 결과를 나타낸 그래프이다.
도 5는 예시적인 일구현예에 따른 적층 세라믹 커패시터(Multi-Layered Ceramic Capacitor, MLCC)의 개략도이다.
도 6 및 7은 일구현예에 따른 유전체의 결정구조를 설명하기 위한 X선 회절 패턴을 도시한 것이다.
| 구분 | 유전체의 조성 |
| 비교예 1 | Bi0.5Na0.5TiO3 |
| 실시예 1 | 0.1Ba(Mg1/3Nb2/3)O3-0.9Bi0.5Na0.5TiO3 |
| 실시예 2 | 0.2Ba(Mg1/3Nb2/3)O3-0.8Bi0.5Na0.5TiO3 |
| 실시예 3 | 0.3Ba(Mg1/3Nb2/3)O3-0.7Bi0.5Na0.5TiO3 |
| 실시예 4 | 0.4Ba(Mg1/3Nb2/3)O3-0.6Bi0.5Na0.5TiO3 |
| 실시예 5 | 0.5Ba(Mg1/3Nb2/3)O3-0.5Bi0.5Na0.5TiO3 |
| 비교예 2 | 0.6Ba(Mg1/3Nb2/3)O3-0.4Bi0.5Na0.5TiO3 |
| 비교예 3 | 0.8Ba(Mg1/3Nb2/3)O3-0.2Bi0.5Na0.5TiO3 |
| 조성 | 공칭 유전율 (@1kHz) |
비저항(ρ) (Ωcm) |
고온 특성 | ||
| εr | tanδ | ΔC/CRT (@-55~200 oC) |
|||
| 비교예 1 | BNT | 474 | 4.1% | 3.7E11 | -35% ~ 62% |
| 실시예 1 | 0.1BMNO-0.9BNT | 1,554 | 0.6% | 5.1E12 | -55% ~ 23% |
| 실시예 2 | 0.2BMNO-0.8BNT | 1,635 | 4.3% | 8.4E12 | -49% ~ -0.3% |
| 실시예 3 | 0.3BMNO-0.7BNT | 1,099 | 0.9% | 1.2E13 | -14% ~ -5% |
| 실시예 4 | 0.4BMNO-0.6BNT | 651 | 0.4% | 2.0E13 | -6.2% ~ -8.0% |
| 실시예 5 | 0.5BMNO-0.5BNT | 409 | 0.7% | 6.6E12 | 0.5% ~ -7% |
| 비교예 2 | 0.6BMNO-0.4BNT | 259 | 0.4% | 1.3E13 | 1.5% ~ -4.6% |
| 비교예 3 | 0.8BMNO-0.2BNT | 123 | 0.7% | 1.2E13 | 0.2% ~ 3.3% |
| 조성 | 공칭 유전율 (@1kHz) |
비저항(ρ) (Ωcm) |
온도 특성 | ||
| εr | tanδ | ΔC/CRT (@-55~200 oC) |
|||
| 실시예 3 | 0.3BMNO-0.7BNT | 1,099 | 0.9% | 1.2E13 | -14% ~ -5% |
| 실시예 6 | 0.2CaSnO3-0.6BNT | 570 | 1.4% | 9.7E12 | 1% ~ -10% |
| 실시예 7 | 0.2SrSnO3-0.8BNT | 711 | 3.1% | 3.7E12 | -28% ~ 54% |
| 실시예 8 | 0.2BaSnO3-0.8BNT | 1,065 | 9% | 3.9E12 | -52% ~ 76% |
| 비교예 1 | BNT | 474 | 1.4% | 3.7E11 | -35% ~ 62% |
| 비교예 5 | 0.3NaNbO3-0.7BNT | 1,360 | 2.1% | 9.3E10 | -8% ~ 32% |
| 비교예 6 | (Ba,Ca)Ti2O5 | 400 | - | 1.5E11 | -10% ~ 11% |
| 구분 | 조성 | 유전 특성 | |||
| ε0 (@ 1kHz) (@dc=0 kV/cm) |
ε (@ 1kHz)
(@dc=87 kV/cm) |
Δε/ε0 | Pr (μC/cm2) |
||
| 실시예 1 | 0.1BaMgNbO3-0.9BNT | 1,554 (tanδ 0.6%) | 1,388 ( ρ : 3.7E11 ) | -10.6% | 3.469 |
| 실시예 2 | 0.2BaMgNbO3-0.8BNT | 1,635 (tanδ 4.3%) | 1,542 ( ρ : 6.7E12 ) | -5.7% | 1.000 |
| 실시예 3 | 0.3BaMgNbO3-0.7BNT | 1,099 (tanδ 0.9%) | 1,110 ( ρ : 3.9E12 ) | +1.0% | 0.171 |
| 실시예 4 | 0.4BaMgNbO3-0.6BNT | 651 (tanδ 0.4%) | 660 ( ρ : 9.0E12 ) | +0.4% | 0.163 |
| 실시예 5 | 0.5BaMgNbO3-0.5BNT | 409 (tanδ 0.7%) | 412( ρ : 1.5E12 ) | +0.4% | 0.03 |
| 실시예 6 | 0.2CaSnO3-0.8BNT | 566( tanδ : 1.4%) | 562 ( ρ : 5.0E12 ) | -0.7% | 0.21 |
| 실시예 7 | 0.2SrSnO3-0.8BNT | 711 (tanδ : 3.1%) | 700 ( ρ : 1.1E12 ) | -1.6% | 0.67 |
| 실시예 8 | 0.2BaSnO3-0.8BNT | 1,065 (tanδ : 9%) | 1,050 ( ρ : 1.8E12 ) | -1.4% | 0.95 |
| 비교예 1 | Bi0.5Na0.5TiO3 (BNT) | 474 | 399 ( ρ : 1.1E10 ) | -16% | 17.1 |
| 비교예 2 | 0.6BaMgNbO3-0.4BNT | 259 (tanδ 0.4%) | 258 ( ρ : 1.3E13 ) | -0.4% | 0.022 |
| 비교예 3 | 0.8BaMgNbO3-0.2BNT | 123 (tanδ 0.7%) | 121 ( ρ : 9.5E12 ) | -5% | 0.002 |
| 비교예 4 | 0.2NaNbO3-0.8BNT | 1,360 (tanδ : 2.1%) | 1,270 ( ρ : 9.3E09 ) | -7% | 1.4 |
| 조성 | 유전 특성 | 온도 특성 | ||||
| εr (@ 1kHz) (LCR meter) |
ε0 (@ 1kHz) (@dc=0 kV/cm) |
ε (@ 1kHz)
(@dc=87 kV/cm) |
Δε/ε0 | Pr (μC/cm2) |
ΔC/CRT (@-55~200 oC) |
|
| 0.1BaMgNbO3-0.9BNT | - | 1,554 (tanδ 0.6%) |
1,388 ( ρ : 3.7E11 ) |
-10.6% | 3.5 | -46% ~ 63% |
| 0.2BaMgNbO3-0.8BNT | - | 1,534 (tanδ 5.9%) |
1,580 ( ρ : 6.4E11 ) |
3.2% | 1.2 | -49% ~ 3.5% |
| 0.3BaMgNbO3-0.7BNT | - | 1,099 (tanδ 0.9%) |
1,110 ( ρ : 3.9E12 ) |
1.0% | 0.17 | -30% ~ -5% |
| 0.1BaSnO3-0.9BNT | 1,306 (tanδ 5.4%) |
1,173 | 1,050 ( ρ : 1.6E12 ) |
-10.5% | 3.57 | -43% ~ 103% |
| 0.2 BaSnO3-0.8BNT | 1,004 (tanδ 11%) |
1,065 | 1,050 ( ρ : 1.8E12 ) |
-1.4% | 0.95 | -52% ~ 76% |
| 0.3BaSnO3-0.7BNT | 856 (tanδ 12%) |
935 | 905 ( ρ : 6.2E12 ) |
-3.2% | 0.51 | -55% ~ 18% |
| 0.1SrSnO3-0.9BNT | 879 (tanδ 3.2%) |
846 | 853 ( ρ : 1.8E12 ) |
0.8% | 2.19 | -28% ~ 66% |
| 0.2SrSnO3-0.8BNT | 640 (tanδ 3.1%) |
711 | 700 ( ρ : 6.8E11 ) |
-1.6% | 0.67 | -28% ~ 54% |
| 0.3SrSnO3-0.7BNT | 474 (tanδ 2.5%) |
488 | 495 ( ρ : 2.3E12 ) |
1.4% | 0.22 | -24% ~ 32% |
| 0.1CaSnO3-0.9BNT | 892 (tanδ 0.7%) |
838 | 819 ( ρ : 4.2E12 ) |
-2.3% | 0.15 | -7% ~ -10% |
| 0.2CaSnO3-0.8BNT | 450 (tanδ 1.4%) |
566 | 562 ( ρ : 5.0E12 ) |
-0.7% | 0.06 | 1% ~ -10% |
| 0.3CaSnO3-0.7BNT | 266 (tanδ 0.6%) |
298 | 299 ( ρ : 3.0E12 ) |
0.3% | 0.13 | 1% ~ -5% |
11: 유전체층 12 내부 전극
13: 외부 전극
Claims (25)
- 하기 화학식 1로 표시되는 복합체를 포함하며,
상기 복합체의 비저항이 1.0E12 Ωcm 이상인 유전체:
[화학식 1]
xABO3-(1-x)(BiaNab)TiO3
상기 식중, A는 알칼리토금속 원소로부터 선택되는 적어도 하나의 원소이고,
B는 전이금속 원소로부터 선택되는 적어도 하나의 원소이고,
0.1≤x≤0.5, 0<a<1, 0<b<1, a+b=1이다. - 제1항에 있어서,
상기 화학식 1에서,
A는 바륨(Ba), 스트론튬(Sr), 칼슘(Ca) 또는 이들의 조합이고,
B는 니켈(Ni), 팔라듐(Pd), 납(Pb), 철(Fe), 이리듐(Ir), 코발트(Co), 로듐(Rh), 망간(Mn), 크롬(Cr), 루테늄(Ru), 레늄(Re), 주석(Sn), 바나듐(V), 저마늄(Ge), 텅스텐(W), 지르코늄(Zr), 몰리브덴(Mo), 하프늄(Hf), 우라늄(U), 니오븀(Nb), 토륨(Th), 탄탈럼(Ta), 비스무트(Bi), 칼슘(Ca), 스트론튬(Sr), 바륨(Ba), 이트륨(Y), 란탄(La), 세륨(Ce), 프라세오디뮴(Pr), 네오디뮴(Nd), 프로메튬(Pm), 사마륨(Sm), 가돌리늄(Gd), 터븀(Tb), 디스프로슘(Dy), 홀뮴(Ho), 어븀(Er), 마그네슘(Mg), 알루미늄(Al), 실리콘(Si), 스칸듐(Sc), 아연(Zn), 갈륨(Ga), 루비듐(Rb), 은(Ag), 카드뮴(Cd), 인듐(In), 안티몬(Sb), 백금(Pt), 금(Au), 납(Pb) 또는 이들의 조합물인 유전체. - 제1항에 있어서,
상기 화학식 1에서, A는 Ba이고, B는 Mg, Nb, Zr, Ta, Fe 또는 이들의 조합인 유전체. - 제1항에 있어서,
상기 화학식 1에서 x는 0.3 내지 0.5인 유전체. - 제1항에 있어서,
상기 복합체가 하기 화학식 2로 표시되는 화합물인 유전체:
[화학식 2]
xBaMgyNb1-yO3-(1-x)(BiaNab)TiO3
화학식 2 중, 0.3≤x≤0.5, 0<y<1, 0<a<1, 0<b<1, a+b=1이다. - 제1항에 있어서,
상기 복합체가 하기 화학식 3으로 표시되는 화합물인 유전체:
[화학식 3]
xBaMg1/3Nb2/3O3-(1-x)(Bi0.5Na0.5)TiO3
화학식 3 중, 0.3≤x≤0.5이다. - 제1항에 있어서,
상기 복합체가 하기 화학식 4로 표시되는 화합물인 유전체:
[화학식 4]
xCaSnO3-(1-x)(BiaNab)TiO3
화학식 4 중, 0.1≤x≤0.5, 0<a<1, 0<b<1, a+b=1이다. - 제7항에 있어서,
상기 화학식 4에서 x는 0.1 내지 0.3인 유전체. - 제1항에 있어서,
상기 화학식 1의 화합물이 xBa(MgcNbd)O3-(1-x)(BiaNab)TiO3, xBa(GacSbd)O3-(1-x)(BiaNab)TiO3, xBa(SccSbd)O3-(1-x)(BiaNab)TiO3, xBa(LacSbd)O3-(1-x)(BiaNab)TiO3, xBa(BcSbd)O3-(1-x)(BiaNab)TiO3, xBa(AlcSbd)O3-(1-x)(BiaNab)TiO3, xBa(LacSbd)O3-(1-x)(BiaNab)TiO3, xBa(IncSbd)O3-(1-x)(BiaNab)TiO3, xBa(YcSbd)O3-(1-x)(BiaNab)TiO3, xBa(CecSbd)O3-(1-x)(BiaNab)TiO3, xBa(NdcSbd)O3-(1-x)(BiaNab)TiO3, xBa(GdcSbd)O3-(1-x)(BiaNab)TiO3, xBa(SmcSbd)O3-(1-x)(BiaNab)TiO3, xBa(EucSbd)O3-(1-x)(BiaNab)TiO3, xBa(TbcSbd)O3-(1-x)(BiaNab)TiO3, xSr(MgcNbd)O3-(1-x)(BiaNab)TiO3, xSr(GacSbd)O3-(1-x)(BiaNab)TiO3, xSr(SccSbd)O3-(1-x)(BiaNab)TiO3, xSr(LacSbd)O3-(1-x)(BiaNab)TiO3, xSr(BcSbd)O3-(1-x)(BiaNab)TiO3, xSr(AlcSbd)O3-(1-x)(BiaNab)TiO3, xSr(LacSbd)O3-(1-x)(BiaNab)TiO3, xSr(IncSbd)O3-(1-x)(BiaNab)TiO3, xSr(YcSbd)O3-(1-x)(BiaNab)TiO3, xSr(CecSbd)O3-(1-x)(BiaNab)TiO3, xSr(NdcSbd)O3-(1-x)(BiaNab)TiO3, xSr(GdcSbd)O3-(1-x)(BiaNab)TiO3, xSr(SmcSbd)O3-(1-x)(BiaNab)TiO3, xSr(EucSbd)O3-(1-x)(BiaNab)TiO3, xSr(TbcSbd)O3-(1-x)(BiaNab)TiO3, xCa(MgcNbd)O3-(1-x)(BiaNab)TiO3, xCa(GacSbd)O3-(1-x)(BiaNab)TiO3, xCa(SccSbd)O3-(1-x)(BiaNab)TiO3, xCa(LacSbd)O3-(1-x)(BiaNab)TiO3, xCa(BcSbd)O3-(1-x)(BiaNab)TiO3, xCa(AlcSbd)O3-(1-x)(BiaNab)TiO3, xCa(LacSbd)O3-(1-x)(BiaNab)TiO3, xCa(IncSbd)O3-(1-x)(BiaNab)TiO3, xCa(YcSbd)O3-(1-x)(BiaNab)TiO3, xCa(CecSbd)O3-(1-x)(BiaNab)TiO3, xCa(NdcSbd)O3-(1-x)(BiaNab)TiO3, xCa(GdcSbd)O3-(1-x)(BiaNab)TiO3, xCa(SmcSbd)O3-(1-x)(BiaNab)TiO3, xCa(EucSbd)O3-(1-x)(BiaNab)TiO3, 또는 xCa(TbcSbd)O3-(1-x)(BiaNab)TiO3이며,
상기 화학식에서 x는 0.1 내지 0.5이고, 0<a<1, 0<b<1, a+b=1이고, 0<c<1, 0<d<1, c+d=1인 유전체. - 제9항에 있어서,
상기 화학식에서 a=0.5, b=0.5이고, 0<c<1, 0<d<1, c+d=1인 유전체. - 제1항에 있어서,
상기 화학식 1로 표시되는 복합체가 능면체(rhombohedral), 사방형(orthorhombic), 큐빅상, 테트라고널 중에서 선택된 하나 이상을 포함하는 복합상 결정구조를 갖는 유전체. - 제1항에 있어서,
상기 화학식 1의 복합체에서 ABO3와 (BiaNab)TiO3가 고용체(solid solution)를 형성하는 유전체. - 제1항에 있어서,
상기 화학식 1의 복합체의 1kHz 내지 1MHz에서의 유전율(permittivity)이 400 이상인, 유전체. - 삭제
- 제1항에 있어서,
상기 화학식 1의 복합체는 -55℃ 내지 200℃의 온도 범위에서 -15% 내지 15% 범위의 정전 용량의 변화를 나타내는, 유전체. - 제1 전극;
상기 제1 전극과 마주하는 제2 전극; 및
상기 제1 전극과 상기 제2 전극 사이에 배치된 유전체층;을 포함하고,
상기 유전체층은 제1항 내지 제13항 및 제15항 중 어느 한 항에 따른 유전체를 포함하는 디바이스. - 제16항에 있어서, 상기 디바이스가 커패시터인 디바이스.
- 제16항에 있어서,
상기 디바이스는 제1 전극, 상기 유전체층 및 상기 제2 전극이 순차적으로 적층되며, 상기 제2 전극 상에 상기 유전체층과 상기 제2 전극이 반복해서 교번 적층된 적층형 커패시터인, 디바이스. - 제17항에 있어서,
상기 커패시터가, 복수의 내부 전극; 및 상기 복수의 내부 전극 사이에 교대로 배치된 유전체층을 포함하는 적층형 커패시터인, 디바이스. - A 함유 염, B 화합물, Bi 화합물, 나트륨염 및 Ti 화합물의 혼합물을 기계적으로 밀링하는 단계; 및
산화성 분위기에서 제1열처리하는 단계;
를 포함하는, 제1항에 따른 유전체의 제조방법. - 제20항에 있어서,
상기 제1열처리가 600 내지 1000℃인 유전체의 제조방법. - 제20항에 있어서,
상기 산화성 분위기에서 제1열처리하는 단계를 실시한 후,
제1열처리를 거친 생성물을 이용하여 성형체를 얻는 단계; 및
상기 성형체를 제2열처리하는 단계를 더 포함하는 유전체의 제조방법. - 제22항에 있어서,
상기 제2열처리가 1000 내지 1600℃인 유전체의 제조방법. - 제20항에 있어서,
상기 기계적 밀링은 볼밀(ball-mill), 에어제트 밀(airjet-mill), 비드밀, 롤밀(roll-mill), 플래너터리밀, 핸드밀링, 고에너지 볼밀(high energy ball mill), 유성 밀(planetary mill) 볼밀, 교반 볼밀(stirred ball mill), 진동밀(vibrating mill), 메카노퓨전밀링(mechanofusion milling), 쉐이커 밀링(shaker milling), 플래너터리 밀링(planetary milling) 및 애트리터 밀리(attritor milling), 디스크 밀링(disk milling), 세이프 밀링(shape milling), 나우타 밀링(nauta milling), 노빌타 밀링(nobilta milling), 고속 혼합(high speed mix) 또는 이들의 조합인 유전체의 제조방법. - 제20항에 있어서,
상기 기계적으로 밀링하는 단계가 용매를 함유한 습식 밀링 단계인 유전체의 제조방법.
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