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홍창효,강진규,조욱,이재신,Hong, Chang-Hyo,Kang, Jin-Kyu,Jo, Wook,Lee, Jae-Shin 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.6
We investigated the effect of $Bi_{1/2}(Na_{0.82}K_{0.18})_{1/2}TiO_3$ (BNKT) modification on the ferroelectric and electric-field-induced strain (EFIS) properties of lead-free $0.97Bi_{1/2}(Na_{0.82}K_{0.18})_{1/2}TiO_3-0.03LaFeO_3$ (BNKTLF) ceramics as a function of BNKT content (x= 0, 0.1, 0.2, 0.3, 0.5, and 1). BNKT-modified BNKTLF powders were synthesized using a conventional solid-state reaction method. As the BNKT content x increased from 0 to 1 the normalized electric-field-induced strain ($S_{max}/E_{max}$) was observed to increase at relatively low fields, i.e., below the poling field. Moreover, BNKTLF-30BNKT showed about 460 pm/V as low as at 3 kV/mm, which is a considerably high value among the lead-free systems reported so far. Consequently, it was confirmed that ceramic-ceramic composite, a mixture of an ergodic relaxor matrix and embedded ferroelectric seeds, is a salient way to make lead-free piezoelectrics practical with enhanced EFIS at low field as well as less hysterical.
이재신,홍창효,강진규,조욱 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.6
We investigated the effect of Bi1/2(Na0.82K0.18)1/2TiO3 (BNKT) modification on the ferroelectric and electric-field-induced strain (EFIS) properties of lead-free 0.97Bi1/2(Na0.82K0.18)1/2TiO3-0.03LaFeO3 (BNKTLF) ceramics as a function of BNKT content (x= 0, 0.1, 0.2, 0.3, 0.5, and 1). BNKT-modified BNKTLF powders were synthesized using a conventional solid-state reaction method. As the BNKT content x increased from 0 to 1 the normalized electric-field-induced strain (Smax/Emax) was observed to increase at relatively low fields, i.e., below the poling field. Moreover, BNKTLF-30BNKT showed about 460 pm/V as low as at 3 kV/mm, which is a considerably high value among the lead-free systems reported so far. Consequently, it was confirmed that ceramic-ceramic composite, a mixture of an ergodic relaxor matrix and embedded ferroelectric seeds, is a salient way to make lead-free piezoelectrics practical with enhanced EFIS at low field as well as less hysterical. 본 연구에서는 Bi1/2(Na0.82K0.18)1/2TiO3 (BNKT)로 변성한 0.97Bi1/2(Na0.82K0.18)1/2TiO3-0.03LaFeO3 (BNKTLF) 무연 압전소재의 강유전성과 전계유기 변형 특성을 조사하였다. BNKT분말과 BNKTLF 분말을 일반적인 고상반응법으로 제조한 다음, BNKT 분말의 비율을 0, 0.1, 0.2, 0.3, 0.5, 1로 변화시키면서 여러 종류의 BNKT-BNKTLF 복합소재를 제조하였다. BNKT 함량이 증가함에 따라 정규화 변형률 Smax/Emax는 항분극전계 이하의 낮은 전계에서 향상되었다. BNKTLF-30BNKT 시료의 변형률은 460 pm/V로 현재까지 보고된 무연 소재계에서는 비교적 우수한 값으로 판명되었다.
옥윤포,강진규,홍창효,이재신,Ok, Yun-Po,Kang, Jin-Kyu,Hong, Chang-Hyo,Lee, Jae-Shin 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.5
A bolt-clamped ultrasonic viscometer was designed and fabricated using a pair of ring-shaped piezoelectric ceramic resonators. For its compactness and low operation frequencies, simulation of piezoelectric resonators was carried out using an ATILA program. Ring-shaped resonators using $0.05Pb(Mn_{1/3}Sb_{2/3})O_3-0.95Pb(Zr_{0.475}Ti_{0.525})O_3$ ceramics were prepared by a conventional ceramic processing, which were then clamped with a pair of metal caps. The fabricated sensor module with a small volume of less than 1 $cm^3$ and an operation frequency as low as 26.5 kHz showed a good relationship between its quality factor and the viscosity of oil.
Van-Quyet Nguyen,홍창효,이현영,공영민,이재신,안경관 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.6
The effects of Li substitution on the crystal structure and the strain properties of Bi<sub>0.5</sub>-(Na<sub>0.82</sub>K<sub>0.18</sub>)<sub>0.5</sub>(Ti<sub>0.95</sub>Sn<sub>0.05</sub>)O<sub>3</sub> ceramics have been investigated. Li substitution enhanced the grain growth and densification, as well as the electric-field-induced strain (EFIS).Without Li substitution, the EFIS was 0.31% under a dc field of 6 kV/mm. However, the EFIS was enhanced to 0.39% when 4 mol% Na was replaced with Li, resulting in a normalized strain (<i>S<sub>max</sub>/E<sub>max</sub></i>) of 646 pm/V. The enhanced strain could be attributed to the increased flexibility in the lattice caused by simultaneous substitutions with both A-site Li ions and B-site Sn ions.