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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Synthesis, crystal structure, and ionic conductivity of tunnel structure phosphates, RbMg_(1-x)H_(2x)(PO3)3·y(H2O)
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Synthesis, crystal structure, and ionic conductivity of tunnel structure phosphates, RbMg_(1-x)H_(2x)(PO3)3·y(H2O)

机译：隧道结构磷酸盐RbMg_（1-x）H_（2x）（PO3）3·y（H2O）的合成，晶体结构和离子电导率

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摘要

A new proton conductor, RbMg_(1-x)H_(2x)(PO3)3·y(H2O) was synthesized by the coprecipitation method followed by sintering at 540 K. The range of solid solution for RbMg_(1-x)H_(2x)(PO3)3·y(H2O) was 0.00 < x < 0.18 and the highest conductivity of 5.5 x 10~(-3) S cm~(-1) was observed at 443 K for the composition of x = 0.11. The structure of RbMg_(1-x)H_(2x)(PO3)3·y(H2O) was determined from 298 to 553 K by Rietveld refinement with multi-profile analysis using X-ray and neutron diffraction data. The framework structure is composed of PO4 tetrahedra connected with each other by corner-sharing to form spiral PO4 chains along the c-direction. One-dimensional tunnels are formed between these spiral chains, in which water molecules are located. The water molecules form one-dimensional spiral chains and are connected to the spiral PO4 chain by hydrogen bonding. The introduction of acidic, hydrophilic head groups (-PO3H) into the PO4 framework by the formation of a solid solution provides binding sites for water and an environment for the efficient diffusion of protons. One-dimensional proton diffusion, similar to proton channels in biological systems, could be explained by the vehicle mechanism of H3O~+ along the one-dimensional water chain.
机译：通过共沉淀法合成了新的质子导体RbMg_（1-x）H_（2x）（PO3）3·y（H2O），然后在540 K下烧结。RbMg_（1-x）H_的固溶范围（2x）（PO3）3·y（H2O）为0.00

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