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    Karışık metal katyonlu borat yapılarının sentezi, yapısal özelliklerinin incelenmesi ve fotodiyot uygulamaları
    (Hitit Üniversitesi, 2025) Yavuz, Mahmut; Köse, Dursun Ali
    The borate structures with the general formula MMeR(BO₃)₂ (M: Na⁺, K⁺; Me: Sr²⁺, Ca²⁺, Ba²⁺; R: La³⁺, Ce³⁺, Nd³⁺, Sm³⁺, Er³⁺), synthesized within the scope of this study, exhibit structural differences compared to borate compounds reported in the literature. In the synthesis of mixed-metal borates containing three different cations, the acetate salts of the cations were used, and the solid-state method was preferred. Mixed-metal borates are compounds formed by the combination of a borate group and two or more metal cations. In the structure of the synthesized mixed-metal borates, alkali metal cations are coordinated by six oxygen atoms, alkaline earth metal (AEM) cations by nine oxygen atoms, and rare earth metal (REM) cations by six oxygen atoms. In recent years, borate materials have increasingly attracted research attention due to their structural diversity and functional properties. Considering the importance of borate compounds in both industrial and scientific research fields, the primary aim of this study is to synthesize novel types of mixed-metal borate compounds and investigate their structural properties. Structures containing isolated boron groups (BO₃³⁻) and (BO₄⁴⁻) demonstrate strong potential for use across a wide spectral range, from the visible (VIS) to deep ultraviolet (UV) regions. Mixed-metal borates are considered promising candidates for improving performance characteristics such as luminescence efficiency, temporal stability, lifetime, and color purity in plasma display panels. The mixed-metal borate compounds synthesized in this study were characterized using various techniques, including powder X-ray diffraction (P-XRD), Fourier-transform infrared spectroscopy (FT-IR), inductively coupled plasma mass spectrometry (ICP-MS), thermal analysis (TGA/DTA), scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDX), and photoluminescence (PL) spectroscopy. Some of the characterized materials (KCaLa(BO₃)₂, KCaNd(BO₃)₂, KSrSm(BO₃)₂, KCaSm(BO₃)₂ and NaSrEr(BO₃)₂) have been developed into devices to be investigated in the context of photodiode applications.