This study deals with the charge transport by protons over hydrogen bonds (HBs) in a rockbridgeite-type compound, Fe²⁺Fe³⁺_3.2(Mn²⁺,Zn)_0.8(PO₄)₃(OH)_4.2(HOH)_0.8. Its dielectric response in a wide frequency range of 1 Hz – 3 GHz from 30 K to 500 K can be traced back to structural properties of this phosphatic oxyhydroxide, revealed by Rietveld refinements using neutron powder diffraction data. The probable charge transport paths for protons are proposed, based on the honeycomb-like distribution of their neutron scattering length densities reconstructed by the Maximum-Entropy Method. Two distinctly decoupled proton dynamic processes occur in this system: at high temperatures, global protonic transport is thermally activated over an energy barrier (E_B) of 0.49 eV, showing a dc conductivity (σ_dc) value of about 10^-4 Ω^-1 cm^-1 at 500 K. The temperature-dependency of σ_dc becomes weaker at decreased temperatures, indicating the possible onset of proton tunneling-dominated charge transport. At low temperatures, relaxational proton hopping within double-well potentials in HBs is thermally activated with E_B = 0.62 eV. An extremely fast relaxation time of ~50 ps at 250 K continuously slows down to ~1 ms at 150 K, pointing to the approach of an orientational proton-glass state at about 125 K. Isosurfaces of bond valence energy landscape maps of H⁺ at 0.49 eV clearly evidence the honeycomb-shaped route for the protonic conductivity at 393 K.

这项研究处理质子通过质子在氢桥化合物（Fe ²⁺ Fe ³⁺ _3.2（Mn 2 ⁺，Zn）_0.8（PO ₄）₃（OH）_4.2（HOH）_0.8中的氢键（HBs）上的迁移。通过中子粉末衍射数据进行的Rietveld精炼揭示了其在30 Hz至500 K的1 Hz – 3 GHz宽频率范围内的介电响应，可以追溯到该羟基氧化磷的结构特性。基于通过最大熵方法重构的中子散射长度密度的蜂窝状分布，提出了质子可能的电荷传输路径。两个明显解耦质子动态过程发生在该系统中：在高温下，全球质子迁移进行热过的能量势垒（E激活_乙）0.49电子伏特，示出了直流电导率（σ _DC）的约10值^-4  Ω ^-1 厘米^-1在σ的500 K的温度依赖性_直流电在降低的温度下变得更弱，表明质子隧穿为主的电荷传输可能开始。在低温下，HBs的双阱电势内的弛豫质子跳跃被E _B  = 0.62 eV热激活。250 K时〜50 ps的极快弛豫时间在150 K时连续减速至〜1 ms，这表明取向质子玻璃态在125 K时接近。H ⁺处键价能态等价图0.49 eV清楚地证明了393 K时质子传导率的蜂窝状路径。