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室温铁电性阴性液晶显示出大而不同的密度

Charles Parton-Barr¹, Helen F Gleeson¹, Richard J Mandle^1,2

¹School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK.

|January 2, 2024

概括

铁电阴性相 (N_F) 比传统的液晶密度更高,其密度在相位过渡时增加. 这一发现有助于理解和开发新的铁电液晶材料.

科学领域:

材料科学材料科学材料科学
凝聚物质物理学凝聚物质物理学
物理化学物理化学

背景情况:

铁电阴性相 (N_F) 是一种新的物质状态,它结合了方向性和极性秩序.
原子模拟预测N_F阶段由于极性顺序,比传统的内马特密度更高.

研究的目的:

通过实验来确定铁电阴性材料的密度.
为了研究N_F相的温度依赖密度行为.
探索密度,极性顺序和光学特性之间的关系.

主要方法:

使用振荡式U管密度计进行精确的密度测量.
记录了传统液晶和新型铁电磁体 (M5) 的温度依赖密度.
测量了折射率 (n_o和n_e) 来探测高密度的后果.

主要成果:

介绍了铁电阴性材料 (M5) 的第一个实验密度数据.
在研究温度中观察到M5的稳定高密度 (>1.3gcm-3).
发现密度在相位过渡时增加,与I-N相比,在N_X-N_F过渡时的增量较小.

结论:

铁电磁性材料的密度明显高于传统的磁性材料.
N_F材料的极性影响其光学特性,抵消密度效应.
开发了一种方法,用实验密度数据从极化测量中近似计算极性顺序参数.

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