Aziz Nor Diyana Abdul, Kamarulzaman Alyea Sofea, Ibrahim Norazila, Mohamed Zakiah
School of Chemistry, Faculty of Applied Science, Universiti Teknologi MARA, Shah Alam 40450, Selangor, Malaysia.
School of Physics, Faculty of Applied Science, Universiti Teknologi MARA, Shah Alam 40450, Selangor, Malaysia.
Materials (Basel). 2022 Jul 23;15(15):5123. doi: 10.3390/ma15155123.
A new series of SrTiCoMnO (0.0 ≤ ≤ 0.7) materials has been synthesized using the conventional solid-state method. In this research, X-ray diffraction (XRD) results showed that Mn was successfully doped at the Co site in a cubic structure with monoclinic 2/ space group. The effect of Mn cation substitution on the structural, optical and electrical performance of SrTiCoMnO double perovskite was investigated. The optical study revealed a nonlinearity pattern of the band gap that is referred to as the band gap bowing trend. Results from optical and Rietveld refinement supports that the band gap bowing trend is correlated with the charge distribution that produces unique effects on structural and size changes due to the Co-Mn compositions. The morphological scanning electron microscopy studies also showed that larger crystallite sizes were developed when dopant was added. Furthermore, increases in the conductivities support the lowering band gap of Mn-doped samples. Here, the intermixing of the atomic orbitals of Co-Mn provides an efficient interlink electrical pathway to improve conductivity and exhibits a high dielectric property at room temperature. These values are strong evidence that STCM material will be suitable for applications in the semiconductor industry.
采用传统固态法合成了一系列新的SrTiCoMnO（0.0≤≤0.7）材料。在本研究中，X射线衍射（XRD）结果表明，Mn成功地掺杂在具有单斜2/空间群的立方结构的Co位点上。研究了Mn阳离子取代对SrTiCoMnO双钙钛矿结构、光学和电学性能的影响。光学研究揭示了带隙的非线性模式，即所谓的带隙弯曲趋势。光学和Rietveld精修结果表明，带隙弯曲趋势与电荷分布相关，由于Co-Mn组成，电荷分布对结构和尺寸变化产生独特影响。形态扫描电子显微镜研究还表明，添加掺杂剂时会形成更大的微晶尺寸。此外，电导率的增加支持了Mn掺杂样品带隙的降低。在此，Co-Mn原子轨道的混合提供了一条有效的互连电通路，以提高导电性，并在室温下表现出高介电性能。这些值有力地证明了STCM材料将适用于半导体工业应用。
