High‐pressure neutron diffraction measurements of polycrystalline LaFeO₃ are collected up to 5.5 and 6.4 GPa at 290 and 110 K, respectively. The bulk moduli are determined as B₀(290 K) = 170(3) GPa and B₀(110 K) = 175(1) GPa. The unit cell is found to compress anisotropically at both temperatures with the a‐axis compressing preferentially. A crossover in lattice parameters is observed, from a > c to c > a, at 2 GPa at 290 K and at 1.7 GPa at 110 K. The magnetic moment remains unchanged over the pressure range investigated, with a value of 4.4 μ_B and 4 μ_B at 110 and 290 K, respectively. Analysis of the octahedral tilting angles and the spontaneous lattice strains shows an increased orthorhombic distortion with pressure, but shows no trend toward a change in symmetry. High‐pressure Raman spectroscopy measurements at room temperature are in agreement with the diffraction data.

中文翻译：

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LaFeO3在高压下的细微结构变化

多晶LaFeO ₃的高压中子衍射测量分别在290 K和110 K时分别达到5.5 GPa和6.4 GPa。本体模量确定为B ₀（290 K）= 170（3）GPa和B ₀（110 K）= 175（1）GPa。发现晶胞在两个温度下均各向异性压缩，其中a轴优先压缩。在晶格参数甲交叉观察到，从一个 >  ç到ç  > 一个，在为2GPa在290 K和在为1.7GPa，在110 K的磁矩保持不变在压力范围的调查，4.4的值 μ_乙和4  μ_B分别为110 K和290K。对八面体倾斜角和自发晶格应变的分析显示，随着压力的增加，正交畸变会增加，但不会出现对称性变化的趋势。室温下的高压拉曼光谱测量与衍射数据一致。