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Do, Nam-Binh,Lee, Han-Bok,Yoon, Chang-Ho,Kang, Jin-Kyu,Lee, Jae-Shin,Kim, Ill-Won The Korean Institute of Electrical and Electronic 2011 Transactions on Electrical and Electronic Material Vol.12 No.2
The effect of Ta substitution on the crystal structure, ferroelectric, and piezoelectric properties of $Bi_{0.5}(Na_{0.82}K_{0.18})_{0.5}Ti_{1-x}Ta_xO_3$ ceramics has been investigated. The Ta doping resulted in a transition from coexistence of ferroelectric tetragonal and rhombohedral phases to an electrostrictive pseudocubic phase, leading to degradations of the remnant polarization, coercive field, and piezoelectric coefficient $d_{33}$. However, the electricfield-induced strain was significantly enhanced by the Ta substitution-induced phase transition and reached a highest value of $S_{max}/E_{max}$ = 566 pm/V under an applied electric field 6 kV/mm when 2% Ta was substituted on Ti sites. The abnormal enhancement in strain was attributed to the pseudocubic phase with high electrostrictive constants.
Do Nam Binh,Ali Hussain,이희동,Ill-Whan Kim,김일원,태원필,이재신 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.41
The effects of Y doping on the crystal structure, and on the ferroelectric and the piezoelectric properties of Bi0.5(Na0.82K0.18)0.5TiO3 ceramics have been investigated. The Y doping induced a transition from a ferroelectric (FE) tetragonal to an electrostrcitive (ES) pseudocubic phase, leading to the degradations of the dielectric constant, loss tangent, the remnant polarization, coercive field, and piezoelectric coefficient d33. However, the electric-field-induced strain was significantly enhanced by the Y-doping-induced phase transition and reached the highest value of Smax/Emax = 278 pm/V when 0.7 wt% Y2O3 was doped. The abnormal enhancement in strain was attributed to the coexistence of FE and ES phases, which provided more degrees of freedom for domain reorientation under electric fields.
Nam-Binh Do,Han-Bok Lee,Chang-Ho Yoon,Jin-Kyu Kang,이재신,김일원 한국전기전자재료학회 2011 Transactions on Electrical and Electronic Material Vol.12 No.2
The effect of Ta substitution on the crystal structure, ferroelectric, and piezoelectric properties of Bi0.5(Na_(0.82)K_(0.18))_(0.5)TiO_3 ceramics has been investigated. The Ta doping resulted in a transition from coexistence of ferroelectric tetragonal and rhombohedral phases to an electrostrictive pseudocubic phase, leading to degradations of the remnant polarization, coercive field, and piezoelectric coefficient d_(33·) However, the electricfield-induced strain was significantly enhanced by the Ta substitution-induced phase transition and reached a highest value of S_(max)/E_(max) = 566 pm/V under an applied electric field 6 kV/mm when 2% Ta was substituted on Ti sites. The abnormal enhancement in strain was attributed to the pseudocubic phase with high electrostrictive constants.
Minh Doan Binh,Sinh Cao Truong,Dong Le Thanh,Loi Cao Ba,Nam Le Van,Binh Do Nhu 대한기생충학ㆍ열대의학회 2020 The Korean Journal of Parasitology Vol.58 No.4
Trombiculid “chigger” mites (Acari) are ectoparasites that feed blood on rodents and another animals. A cross-sectional survey was conducted in 7 ecosystems of southern Vietnam from 2015 to 2016. Chigger mites were identified with morphological characteristics and assayed by polymerase chain reaction for detection of rickettsiaceae. Overall chigger infestation among rodents was 23.38%. The chigger index among infested rodents was 19.37 and a mean abundance of 4.61. A total of 2,770 chigger mites were identified belonging to 6 species, 3 genera, and 1 family, and pooled into 141 pools (10–20 chiggers per pool). Two pools (1.4%) of the chiggers were positive for Orientia tsutsugamushi. Ricketsia spp. was not detected in any pools of chiggers. Further studies are needed including a larger number and diverse hosts, and environmental factors to assess scrub typhus.
Yeonjin Je,Eunjeong Kim,Nguyen Vu Binh,Hyeongtae Kim,Su-yeon Cho,Do-Hyeon Lee,Mi Ji Kwon,Moonhee Choi,Jae Hyun Lee,Woo Hyun Nam,Younki Lee,Jung Young Cho,Jun Hong Park 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.5
Since the emergence of layered two-dimensional materials, the development of methods for their large-scale synthesis has become crucial for integrating these materials into existing fabrication processes. In this study, we report the synthesis of a NiTe 2 single crystal on the near-centimeter scale using the molten salt fl ux method (MSFM). The single-crystal nature of the synthesized NiTe 2 sample was confi rmed using X-ray diff raction analysis, while its chemical characteristics were analyzed using X-ray photoelectron spectroscopy, which confi rmed Ni–Te chemical binding. The layered structure of the ingot was confi rmed using Raman spectroscopy; two prominent signals were observed, at 84 and 138 cm −1 , which were consistent with the in-plane vibrational mode, E g , and out-of-plane vibrational mode, A 1g . In addition, analyses performed on diff erent fl akes confi rmed the structural uniformity of the single crystal, as only a small variation in the peak-to-peak position of the full width at half maximum was observed. Using Kelvin probe force microscopy, the electronic structure of the NiTe 2 multilayered surface was investigated to determine its surface work function, which was found to be 4.4–4.8 eV. A back-gate fi eld-eff ect transistor was fabricated using the single-crystal NiTe 2 to evaluate its semimetallic characteristics; the transfer characteristic of the NiTe 2 FET, determined by applying a back-gate bias, showed weak gate voltage dependence and linear I–V characteristics, in keeping with the linear I D -V D output characteristics. Therefore, the synthesis of NiTe 2 via the MSFM should facilitate the integration of layered materials with existing fabrication processes for the mass production of electronic devices.
Jeong, Seong-Kyu,Hong, In-Ki,Do, Nam-Binh,Tran, Vu Diem Ngoc,Cho, Seong-Youl,Taib, Weon Pil,Lee, Jae-Shin The Korean Powder Metallurgy Institute 2010 한국분말재료학회지 (KPMI) Vol.17 No.5
The effects of $MnO_2$ doping on the crystal structure, ferroelectric, and piezoelectric properties of (K,Na)$NbO_3$ (KNN) ceramics have been investigated. $MnO_2$ was found to be effective in enhancing the densification and grain growth during sintering. X-ray diffraction analysis indicated that Mn ions substituted B-site Nb ions up to 2 mol%, however, further doping induced unwanted secondary phases. In comparison with undoped KNN ceramics, the well developed microstructure and the substitution to B-sites in 2 mol% Mn-doped KNN ceramics resulted in significant improvements in both piezoelectric coupling coefficient and electromechanical quality factor.