Material Research Laboratory, Department of Physics, Deenbandhu Chhotu Ram University of Science & Technology, Murthal, 131039, India.
Environ Sci Pollut Res Int. 2023 Sep;30(44):98609-98618. doi: 10.1007/s11356-022-21867-7. Epub 2022 Jul 7.
Glass-ceramics with novel composition xZrO.7PO.19CaO.24NaO.(50-x)BO (x = 0, 2, 4, 6, and 8 mol%) have been synthesized using melt quench technique. The synthesized compositions were characterized and analyzed by X-ray diffraction, field emission scanning electron microscopy, infrared absorption, and impedance spectroscopy. X-ray diffraction profiles of prepared samples confirm the existence of phases corresponding to NaCa(PO) crystal (with crystallite size ~ 23 nm). Infrared absorbance spectra reveal the presence of phosphate and borate units (PO, PO, BO, BO) in the glass matrix. Different dielectric parameters such as dielectric loss, electric modulus, and tangent loss were evaluated. Their variations with temperature and frequency confirm the non- Debye relaxation behavior of prepared samples. A phenomenal description of the capacitive behavior was studied by considering the circuit having a parallel combination of constant phase element and bulk resistance. The conduction is found to be governed by overlapping large polaron tunneling (OLPT) and follow OLPT model. The results indicate that ZrO substituted alkali phosphoborate glass-ceramics can be used as eco-friendly and safe dielectric materials.
采用熔融淬冷法合成了组成新颖的 xZrO.7PO.19CaO.24NaO.(50-x)BO（x = 0、2、4、6 和 8 mol%）微晶玻璃。通过 X 射线衍射、场发射扫描电子显微镜、红外吸收和阻抗谱对合成的组成物进行了表征和分析。制备样品的 X 射线衍射图谱证实了存在对应于 NaCa(PO)晶体（晶粒尺寸约为 23nm）的相。红外吸收光谱显示玻璃基质中存在磷酸盐和硼酸盐单元（PO、PO、BO、BO）。评估了不同的介电参数，如介电损耗、电模量和切向损耗。它们随温度和频率的变化证实了所制备样品的非德拜弛豫行为。通过考虑具有恒相元件和体电阻并联组合的电路，对电容行为进行了现象学描述。发现传导受重叠大极化子隧道（OLPT）控制，并遵循 OLPT 模型。结果表明，ZrO 取代的碱磷硼酸盐微晶玻璃可用作环保且安全的介电材料。
