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Magnetic Properties of R-YIG (R = La, Nd, and Gd) Derived by a Sol-gel Method
Young Rang Uhm,Jae Cheong Lim,Sang Mu Choi,Chul Sung Kim 한국자기학회 2016 Journal of Magnetics Vol.21 No.3
Y3-xRxFe₅O12 (R = La, Nd, and Gd) powder were fabricated using a sol-gel pyrolysis method. Their magnetic properties and crystalline structures were investigated using x-ray diffraction (XRD), a vibrating sample magnetometer (VSM), and Mössbauer Spectrometer. The Mössbauer spectra for the powders were taken at various temperatures ranging from 12 K to Curie temperature (Tc). The isomer shifts indicated that the valence states of Fe ions for the 16(a) and 24(d) sites have a ferric character. The saturation magnetization (Ms) increases from 32 to 34 (emu/g) for the YIG, and Nd-YIG, respectively. However, Ms decreases to 27 (emu/g) at Gd-YIG.
Risk factors and clinical symptoms of gastroesophageal reflux disease (초)
( Eun Sil Lee ),( Na Young Kim ),( Jong Chon Nah ),( Youn Mu Jung ),( Ji Eon Won ),( Min Sik Uhm ),( Kwang Ho Lee ),( Sang Hyub Lee ),( Young Soo Park ),( Jin Wook Kim ),( Sook Hyang Jeong ),( Dong Ho 대한내과학회 2008 대한내과학회 추계학술대회 Vol.2008 No.-
뫼스바우어선원 적용을 위한 <sup>58</sup>Ni 표적체 및 Co가 확산된 Rh복합재 제조
엄영랑,최상무,김종범,손광재,Uhm, Young Rang,Choi, Sang Mu,Kim, Jong-bum,Son, Kwang Jae 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.6
The en-riched $^{58}Ni$ powders are dissolved in acid solution and coated on a Cu target for proton irradiation at cyclotron to produce $^{57}Co$ radioisotope. The condition of the plating bath and the coating process are determined using the en-riched powders. To establish the coating conditions for $^{57}Co$, non-radioactive Co ions are dissolved in an acid solution and electroplated on to a rhodium plate. The thermal diffusion of electroplated Co into a rhodium matrix was studied to apply a $^{57}Co$ Mssbauer source. The diffusion depth from surface to matrix of Co is depended on the annealing temperature and time. The deposited Co atoms diffuse completely into a rhodium (Rh) matrix without substantial loss at an annealing temperature of 1200 for 4 hours.
Risk factors and Clinical symptoms of Gastroesophageal reflux disease (초)
( Eun Sil Lee ),( Na Young Kim ),( Jong Chon Nah ),( Youn Mu Jung ),( Ji Eon Won ),( Min Sik Uhm ),( Kwang Ho Lee ),( Sang Hyub Lee ),( Young Soo Park ),( Jin Wook Kim ),( Sook Hyang Jeong ),( Dong Ho 대한내과학회 2008 대한내과학회지 Vol.75 No.1S