科研之友
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摘要
High-temperature coherent neutron powder diffraction experiments were carried out on Li2B4O7 with boron isotope ratio B-11 : B-10 as high as 99.6 : 0.4%. Neither traces of phase transformations nor discontinuous changes of physical properties were observed. Anomalies in the thermal expansion of lithium tetraborate were considered in terms of first-order Gruneisen approximation. Extended bond length analysis revealed significant modifications of the boron-oxygen framework which is supplemented by dynamic lithium disorder. Impedance spectroscopy studies revealed a complicated conduction mechanism in single crystalline lithium tetraborate. The lithium diffusion pathway for bulk conductivity along the polar axis was established using both maximum entropy and anharmonic refinement techniques.
- 出版日期2012-5-2
