Synthesis and optical properties of blue inorganic pigments with tetrahedrally coordinated Co2+/Ni2+ in Li2ZnSiO4

IF 5.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-08-23 DOI:10.1016/j.materresbull.2025.113753

Qiuyu Cheng , Zhiwei Wang , Ayahisa Okawa , Takuya Hasegawa , Tohru Sekino , Shu Yin

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Abstract

Solid solutions with the general formulas Li₂Zn_1-_xCo_xSiO₄ (0 ≤ x ≤ 1) and Li₂Zn_1-_xNi_xSiO₄ (0 ≤ x ≤ 0.25) were successfully synthesized via a conventional high-temperature solid state reaction method. XRD confirmed the formation of phase-pure products, while XPS verified that both cobalt and nickel ions are present in the + 2 oxidation state. The undoped Li₂ZnSiO₄ appeared white; however, even minor incorporation of Co²⁺ or Ni²⁺ ions induced a blue coloration in the resulting materials. UV–Vis–NIR spectroscopy revealed characteristic absorption bands associated with tetrahedrally coordinated Co²⁺ or Ni²⁺ ions, accounting for the observed blue color. TG-DTA analysis confirmed that the pigments exhibit thermal stability up to 1200 °C. Furthermore, the addition of only 2 wt% of the pigments into a transparent poly(methyl methacrylate) (PMMA) matrix produced vibrant blue composites, indicating their promising applicability in PMMA-based decorative materials.

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Li2ZnSiO4中四面体配位Co2+/Ni2+蓝色无机颜料的合成及光学性能

采用常规高温固相反应方法成功合成了通式Li2Zn1-xCoxSiO4（0≤x≤1）和Li2Zn1-xNixSiO4（0≤x≤0.25）的固溶体。XRD证实形成了相纯产物，XPS证实钴离子和镍离子均以+ 2氧化态存在。未掺杂的Li2ZnSiO4呈白色；然而，即使是少量的Co2+或Ni2+离子的掺入也会导致材料呈现蓝色。紫外-可见-近红外光谱显示出与四面体配位的Co2+或Ni2+离子相关的特征吸收带，这是观察到的蓝色。TG-DTA分析证实，颜料表现出高达1200°C的热稳定性。此外，在透明的聚甲基丙烯酸甲酯（PMMA）基体中只添加2%的颜料就能产生充满活力的蓝色复合材料，这表明它们在PMMA基装饰材料中有很好的适用性。

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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.