ABSTRACT

Herein, we report the phase evolution of perovskite-type copper zirconate nanoparticles synthesized via the coprecipitation method. The XRD investigations confirm the dominant orthorhombic CuZrO₃ phase formation at 700 °C along with frail tetragonal ZrO₂ and monoclinic CuO phases. XRD analysis confirms the presence of orthorhombic perovskite type CuZrO₃ in the sample annealed at 700 °C with cell parameters: a = 6.4552 Å, b = 7.4008 Å, and c = 8.4013 Å whose crystallite sizes is 54 nm. Higher calcination temperatures (above 700 °C) induce the crystallinity deterioration in the CuZrO₃ phase. The XPS studies substantiate the chemical state of constituent elements present in the sample annealed at 700 °C. The chemical bonding and optical features of the samples were probed using FTIR and UV-Vis-NIR spectroscopy, respectively. The optical bandgap energies for the synthesized samples that were annealed at various temperatures ranged from 3.36–3.08 eV.

摘要

在此，我们报告了通过共沉淀法合成的钙钛矿型锆酸铜纳米粒子的相演化。XRD 研究证实了在 700 °C 时主要的正交晶系 CuZrO ₃相形成以及脆弱的四方 ZrO ₂和单斜晶系 CuO 相。XRD 分析证实在 700 °C 下退火的样品中存在正交钙钛矿型 CuZrO 3 ，电池参数为：a = 6.4552 Å、b = 7.4008 Å 和 c = 8.4013 Å，微晶尺寸为 54 nm _。较高的煅烧温度（高于 700 °C）会导致 CuZrO _{3的结晶度下降}阶段。XPS 研究证实了在 700 °C 退火的样品中存在的组成元素的化学状态。分别使用 FTIR 和 UV-Vis-NIR 光谱探测样品的化学键合和光学特征。在不同温度下退火的合成样品的光学带隙能量范围为 3.36–3.08 eV。