포항공과대학교 · 재료과학
Jitendra Pal Singh 교수의 연구실은 페로자성 나노물질, 특히 아연 페라이트, 니켈 페라이트, cobalt 페라이트 등의 나노구조 페라이트를 중심으로 구조적, 전기적, 자기적, 광학적 성질을 연구하고 있습니다. 이들은 이온 빔 조사, 도핑, 열처리 등을 통해 나노입자의 크기 및 상전이 제어를 통해 물성 조작을 추구하며, 다기능성 소재 개발에 초점을 맞추고 있습니다. 특히, 다이아파라자성, 자기광학 특성, 다이렉티브 성질 등 응용 가능성이 높은 신소재의 기초 연구를 진행하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Abstract Zinc ferrite nanoparticles of different sizes ranging from 12 to 62 nm were synthesized by using the nitrate route. These nanoparticles were irradiated by a 100 MeV oxygen beam at two fluences: 1 × 10 13 and 5 × 10 13 ions/cm 2 . It was observed that modes corresponding to cubic spinel phase were retained after the irradiation in all the systems. The variation in the parameters of various modes follows phonon confinement, while this effect seems to violate in irradiated specimen. It was
Bulk zinc ferrite has been studied in the past. In the bulk form zinc ferrite crystallizes in the normal spinel structure with all the zinc ions occupying the tetrahedral and all the iron occupying the octahedral sites, respectively. But, nanosize zinc ferrite is believed to crystallize in a different way. It is now well established that in a nanosize zinc ferrite there is partial inversion in the cation occupancy, leading to some kind of magnetic ordering in this system much above its Neel temp
This paper reports the study of structural, electrical, magnetic and optical properties of Gd-doped nickel ferrite nanoparticles in order to investigate the possibility of multiferroism. The NiGd 0.04 Fe 1.96 O 4 nanoparticles were prepared by a chemical route and characterized by various techniques. Doping with Gd ions induces poor ferroelectricity in nickel ferrite. This may be attributed to the small distortion in the centrosymmetric fcc structure because of the presence of large Gd ions.
Present work reports 200 MeV Ag 15+ irradiation induced effects on the surface morphology, grain size and local electronic structure in MgO thin films deposited by e-beam evaporation under ultra High vacuum. The grain size was found to decrease from 37 nm (pristine film) to 23 nm for the sample irradiated with fluence of 1×10 12 ions/cm 2 and thereafter it increases upto fluence of 5×10 12 ions/cm 2 . Similar changes with ion fluence were also observed for surface roughness. Shifting and disappe
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Jitendra Pal Singh, R. C. Srivastava, H. M. Agrawal; Optical Behaviour of Zinc Ferrite Nanoparticles. AIP Conference Proceedings 4 October 2010; 1276 (1): 137–143. https://doi.org/10.1063/1.3504278 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley
In this chapter, we present an overview of synthesis of MgO nanoparticles and thin films by using top-down and bottom-up approaches. The bottom-up approaches are generally utilized to grow nanoparticles by the methods that involve chemical reactions. Sometimes, methods based on these reactions are also able to grow thin films. The top-down approaches are preferred for growing thin films where bulk material is used for depositions. The methods, which are frequently used, are radio frequency sputt
