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뫼스바우어 분광법과 색도 분석에 의한 고대 고려청자의 발색메카니즘 연구
전아영,노형구,김응수,조우석,김경자,김종영,김진모,김철성,강경인,Jeon, A-Young,No, Hyung-Goo,Kim, Ung-Soo,Cho, Woo-Seok,Kim, Kyung-Ja,Kim, Jong-Young,Kim, Chin-Mo,Kim, Chul-Sung,Kang, Gyung-In 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.1
In ancient Goryeo celadon, the effect of the chemical composition and ionic state of Fe on the color was evaluated by Mossbauer spectroscopy and Design of Experiment (DOE) analysis. The ancient celadon pieces excavated from the kiln sites in GangJin and Buan areas were analyzed by Mssbauer spectroscopy, chromaticity, and DOE analysis. The color of celadon was found to be mainly determined by that of glaze since variations of $L^*$, $a^*$, and $b^*$ values for the body were much smaller than those for the glaze. As $Fe^{2+}$/$Fe^{3+}$ in glaze increases, $L^*$ value increases, whereas $a^*$/$b^*$ value decreases, which is well consistent with the result on the synthetic glaze. As the amount of titanium increases in the glaze, the $a^*$ and $b^*$ values decrease; on the other hand, the $L^*$ value increases, which is well consistent with the result on the synthetic glaze.
청자 유약 발색메카니즘에 대한 뫼스바우어 분광법에 의한 연구
김종영,노형구,전아영,김응수,조우석,김경자,김진모,김철성,Kim, Jong-Young,No, Hyung-Goo,Jeon, A-Young,Kim, Ung-Soo,Cho, Woo-Seok,Kim, Kyung-Ja,Kim, Chin-Mo,Kim, Chul-Sung 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.1
Systematic study on relationship between celadon coloring and glaze component was conducted by chromaticity analysis and M$\ddot{o}$ssbauer spectroscopic analysis. The chromaticity ($L^*$, $a^*$, $b^*$ values) and M$\ddot{o}$ssbauer analysis results were correlated to the amount of $Fe_2O_3$, $TiO_2$, MnO, and $P_2O_5$, which are the essential factors influencing celadon coloring. According to chromaticity analysis, celadon glaze color belongs to GY group when the addition of $TiO_2$ was 1.4%, whereas the color belongs to BG group when the addition of $TiO_2$ was 0.1%. For the GY group, the colors change from GY to YR with the decrease of brightness as the addition of $TiO_2$, MnO, and $P_2O_5$ increases. According to M$\ddot{o}$ssbauer analysis results, as the amount of divalent iron ion increases, the $a^*$ and $b^*$ values decrease, on the other hand, $L^*$ value increases. The ratio of divalent iron ion produced in reductive sintering process is found to be 80~95% in this study, which induces the increase of $L^*$ values in celadon glaze.
임정태(Jung Tae Lim),김진모(Chin Mo Kim),김철성(Chul Sung Kim) 한국자기학회 2012 韓國磁氣學會誌 Vol.22 No.1
Ba<SUB>2</SUB>Mg<SUB>0.5</SUB>Co<SUB>1.5</SUB>(Fe<SUB>0.99</SUB>In<SUB>0.01</SUB>)<SUB>12</SUB>O<SUB>22</SUB> was prepared by the conventional solid-state reaction method, and studied by x-ray diffractometer, vibrating sample magnetometer, and Mossbauer spectrometer. The crystal structure was determined to be a single-phased rhombohedral with space group R-3m. Magnetization value were M<SUB>s</SUB> = 28.6 emu/g at 295 K. The hysteresis loops indicate that all the samples are ferrimagnetic behaviors. Mossbauer spectra of Ba<SUB>2</SUB>Mg<SUB>0.5</SUB>Co<SUB>1.5</SUB>(Fe<SUB>0.99</SUB>In<SUB>0.01</SUB>)<SUB>12</SUB>O<SUB>22</SUB> have been 6-sextet taken at various temperatures ranging from 4.2 to 620 K. Based on the isomer shift (δ) values of all samples, the charge states were found to be Fe<SUP>3+</SUP> state at all temperatures, the Curie temperature was determined to be 630 K by the ZVC curve.