Exploratory growth and characterization of CaNdAl3O7 single crystal with nonsymmetric structure in tetragonal family

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths Pub Date : 2025-01-01 DOI:10.1016/j.jre.2023.11.003

Xiangkang Peng, Fapeng Yu

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Abstract

The new component of melilite type crystal CaNdAl₃O₇ (CNA) was grown by the Czochralski pulling method. Single crystal structure analysis was conducted. It is found that the CNA crystal belongs to the tetragonal system with P-42₁m space group. The cell parameters a = b = 0.77461 nm and c = 0.51089 nm. The density and Mohs hardness of CNA crystal are 4.08 g/cm³ and 5.45, respectively. The specific heat of the crystal is 0.57–0.77 J/(g·K) in the temperature range of 30–300 °C. X-ray photoelectron spectroscopy (XPS) shows that the crystal has stable atomic valence states and chemical environment. The vibration state of polyhedra groups in the crystal was measured by Raman spectra, and the piezoelectric response was analyzed based on the calculated results for the polyhedra polarization dipole moments. The relative dielectric permittivity of the CNA crystal at room temperature was determined to be 11.80 and the electrical resistivity was measured to be on the order of 5 × 10⁶ Ω·cm at 800 °C.

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四方族非对称结构CaNdAl3O7单晶的探索性生长与表征

采用Czochralski拉法生长出了新组分的千晶石型晶体CaNdAl3O7 （CNA）。进行了单晶结构分析。结果表明，该晶体属于具有P-421m空间群的四方晶系。细胞参数a = b = 0.77461 nm, c = 0.51089 nm。CNA晶体的密度为4.08 g/cm3，莫氏硬度为5.45。在30 ~ 300℃的温度范围内，晶体比热为0.57 ~ 0.77 J/（g·K）。x射线光电子能谱（XPS）表明该晶体具有稳定的原子价态和化学环境。利用拉曼光谱测量了晶体中多面体群的振动状态，并根据计算结果分析了晶体中多面体的极化偶极矩。测定了CNA晶体在室温下的相对介电常数为11.80，在800℃时测得的电阻率约为5 × 106 Ω·cm。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.