New insights into crystallographic relation and lattice dynamics effects in {CdO/MgO} superlattices grown by plasma-assisted molecular beam epitaxy

IF 5.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-04-30 DOI:10.1016/j.materresbull.2025.113535

A. Wierzbicka , E. Przezdziecka , I. Perlikowski , E. Zielony , A. Adhikari , A. Lysak

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Abstract

This article explores the structural properties of molecular beam epitaxy grown {CdO/MgO} superlattices on sapphire substrates of different crystallographic orientations (a-, c-, r-, and m-plane). The study involves a comprehensive analysis using X-ray diffraction and Raman spectroscopy. High-resolution X-ray diffraction unveils a significant influence of surface symmetry on both the substrates and the epitaxial layers, particularly with respect to the occurrence of twins in the superlattices. Remarkably, no twins were observed on r-oriented sapphire substrates, resulting in improved interface and crystallographic quality. The results of the studies demonstrated in this work show that the growth rate of CdO sublayers within {CdO/MgO} superlattices is intricately dependent on the substrate orientation. Notably, the c-plane and m-plane sapphire substrates yielded thicker CdO sublayers, indicating comparable growth rates for these crystallographic orientations. The a-plane and r-plane orientations, on the contrary, seemed to favor a slower growth rate of CdO sublayers.

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等离子体辅助分子束外延生长的{CdO/MgO}超晶格的晶体学关系和晶格动力学效应的新见解

本文探讨了在不同晶体取向（a-面、c-面、r-面和m-面）的蓝宝石衬底上生长的分子束外延{CdO/MgO}超晶格的结构特性。该研究包括使用x射线衍射和拉曼光谱的综合分析。高分辨率x射线衍射揭示了表面对称性对衬底和外延层的重要影响，特别是在超晶格中孪晶的出现。值得注意的是，在r取向蓝宝石衬底上没有观察到孪晶，从而改善了界面和晶体学质量。研究结果表明，在{CdO/MgO}超晶格中，CdO亚层的生长速率复杂地依赖于衬底取向。值得注意的是，c面和m面蓝宝石衬底产生了更厚的CdO亚层，表明这些晶体取向的生长速度相当。相反，a面和r面取向似乎有利于CdO子层的较慢生长速率。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.