Cu가 도핑된 LSM의 구조분석과 열팽창특성 연구
Structural analysis and thermal expansion property of Cu doped LSM for SOFCs
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이종 원자가를 가지는 Cu의 도핑이 LSM에 미치는 영향을 구조적인 분석과 열팽창계수를 통해서 고찰하였다. 고상반응을 이용하여 La0.8Sr0.2Mn1 − xCuxO3(0 ≤ x ≤ 0.3)을 제조하였으며, Cu의 도핑 함량에 따른 결정구조 및 열팽창계수를확인하였다. Cu 함량이 증가함에 따라서 격자상수와 열팽창계수가 감소하는 경향을 나타냈지만, x = 0.3 인 경우에는 증가하였다. 이러한 격자상수와 열팽창계수의 변화는 Cu이온의 B-site에서의 Mn 자리에 치환될 때 0 ≤ x ≤ 0.2의 범위에서는Cu3+의 존재로 인한 이온 반경의 감소에 의한 것으로 판단되었고, x = 0.3인 경우에는 Cu2+와 Mn4+의 존재로 인한 산소 공공의 증가에 기인한 것이었다.
Abstract
The doping effect of Cu in the Sr-doped lanthan manganites (LSM) has been investigated in terms of structural analysis and thermal expansion coefficient (TEC). The La0.8Sr0.2Mn1 − xCuxO3 (0 ≤ x ≤ 0.3) were prepared by solid state reaction method and their crystal structure and TEC were measured. A decrease in the lattice parameters and the TEC were observed with increase Cu content, whereas they were decreased for x = 0.3. For 0 ≤ x ≤ 0.2, the decrease of the lattice parameter and the TEC with increase Cu content were attributed to the reduction of ionic radius of Cu ions due to the presence of Cu3+ ions. For x = 0.3, however, the increase was originated from the formation of oxygen vacancies due to the presence of Cu2+ and Mn4+.
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