서지주요정보
$Zn_{1-x}Co_xSe$의 광학적 성질과 ZnSe 결정에 대한 Co 불순물의 영향에 관한 연구 = The optical properties of $Zn_{1-x}Co_xSe$ crystals and the Co impurity effects on ZnSe crystal
서명 / 저자 $Zn_{1-x}Co_xSe$의 광학적 성질과 ZnSe 결정에 대한 Co 불순물의 영향에 관한 연구 = The optical properties of $Zn_{1-x}Co_xSe$ crystals and the Co impurity effects on ZnSe crystal / 황인선.
저자명 황인선 ; Hwang, In-Sun
발행사항 [대전 : 한국과학기술원, 1993].
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소장정보

등록번호

8003557

소장위치/청구기호

학술문화관(문화관) 보존서고

MPH 93031

SMS전송

도서상태

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초록정보

In this thesis the optical preporties of the $Zn_{1-x}Co_xSe$ and the Co impurity effects on the ZnSe host crystal is studied. $Zn_{1-x}Co_xSe$ (x < 0.02) polycrystals were prepared by the melt growth technique. There are many peaks appeared in PA absorption spectra in the visible and infrared regions. Among them the weak peaks at $15576cm^{-1}$, $16385cm^{-1}$ and $17212cm^{-1}$ are observed and we assign these peaks to the forbidden transition from the ground state $^4A_2$ to $^2T_2$ and $^2T_1$, $^2E$ $^2T_1$ states, respectively. From the energies of transitions of $Co^{2+}$ in ZnSe the crystal field parameter $\delta$ is obtained to be $3864cm^{-1}$, the Racah parameter B $587cm^{-1}$ and β 0.56. And from the results of XRD and Raman spectroscopy it was found that the lattice constant of the crystal increases linearly to x = 0.0086 and then saturates due to the size effect of the incorporated Co atom as its amount increases. It is also observed that the $TO_2$ and $LO_1$ Raman modes in $Zn_{1-x}Co_xSe$ soften in x < 0.0086 by the addition of Co atoms. The oscillator strength, which is calculated using the energies of $TO_2$ and $LO_1$ phonon modes, decreases as the content of cobalt increases. There is a linear relationship between the ionicity and the oscillator strength with the slope of $-7.02\times10^{15}(\sec^{-1}$). From these observations, it is clear that the instability of $Zn_{1-x}Co_xS$ crystal is mainly due to the ionicity difference between Zn and Co atoms.

서지기타정보

서지기타정보
청구기호 {MPH 93031
형태사항 vii, 65 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : In-Sun Hwang
지도교수의 한글표기 : 박해용
지도교수의 영문표기 : Hae-Yong Park
학위논문 학위논문(석사) - 한국과학기술원 : 물리학과,
서지주기 참고문헌 : p. 63-65
주제 Cobalt.
Lead selenide crystals.
Optical properties.
불순물 (잡물) --과학기술용어시소러스
코발트. --과학기술용어시소러스
광학적 성질. --과학기술용어시소러스
셀렌화아연. --과학기술용어시소러스
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