X-ray diffraction studies of various BiFeO3 particles

X-ray diffraction studies of BiFeO3 powders characterized by different particle size - submicrometric (sBFO) and micrometric (mBFO), including residual stress analysis in powders, determined by sin2(psi) method using (514) peak of rhombohedral R3c structure typical for BiFeO3.XRD studies were performed on powder samples and composites using the D8 Advance diffractometer (Bruker AXS, Karlsruhe, Germany) with Cu-Kα cathode (λ=1.54 Å) operating at 40 kV voltage and 40 mA current. The scan rate was 0.30°/min with scanning step 0.01° in range of 10° to 140° 2Θ for powder, while for composites scan rate 2°/min with scanning step 0.01° was applied. Data collection was performed using LYNXEYE XE-T linear detector (Bruker AXS, Karlsruhe, Germany), operating in a modified high-resolution mode. The high threshold discriminator was maintained at 0.954 V level, while the lower threshold discriminator of detector was increased from 0.614 V up to 0.750 V, in order to minimize fluorescence, regarding the presence of iron ions in the BiFeO3 structure.Stress-XRD analysis was performed with use of iso-inclination mode of D8 Advance (Bruker AXS, Karlsruhe, Germany) based on (514) peak of BiFeO3 phase with the nominal position at 132.429° of 2θ pattern respectively, according to EN-15305 standard. For residual stress analysis, the following materials parameters were used: Poisson ratio 0.2695 and Young modulus 143.53 GPa4,5, which gives S1 = -1.878 ∙ 10-6 MPa and 1/S2 = 8.845 ∙ 10-6 MPa-1. The 11.6 MPa limit was used for a stress-free material. For stress analysis, the standard-fit was used in (514) peak position fitting. Applied stress mode was established as normal. For compressive tests, the DEBEN microtensile stage mounted at D8 Advance diffractometer with a 2kN crosshead was used, moving with a speed of 0.4 mm/min. Studies were performed up to 20 MPa applied stress, using scan rate 2°/min with scanning step 0.01°.

针对粒径各异的钛酸铋（BiFeO3, BFO）粉体（分为亚微米级sBFO与微米级mBFO）开展X射线衍射（X-ray diffraction, XRD）研究，其中涵盖粉体残余应力分析。该残余应力分析采用sin²(ψ)法，以BiFeO3典型菱面体R3c结构的(514)衍射峰为分析对象。本研究采用德国卡尔斯鲁厄布鲁克AXS公司的D8 Advance型X射线衍射仪完成粉体样品与复合材料的XRD测试，该仪器配备Cu-Kα靶（波长λ=1.54 Å），工作电压40 kV、电流40 mA。粉体样品的扫描范围为10°~140° 2θ，扫描速率0.30°/min，步长0.01°；复合材料则采用2°/min的扫描速率，步长同样为0.01°。数据采集采用德国卡尔斯鲁厄布鲁克AXS公司的LYNXEYE XE-T型线性探测器，工作于改进型高分辨率模式。由于BiFeO3结构中存在铁离子，为抑制荧光背景，将探测器的高阈值甄别器固定为0.954 V，同时将低阈值甄别器从0.614 V调整至0.750 V。残余应力XRD分析依据EN-15305标准，采用德国卡尔斯鲁厄布鲁克AXS公司D8 Advance衍射仪的等倾斜模式，以BiFeO3相(514)衍射峰为分析对象，该峰在2θ图谱中的标称位置为132.429°。残余应力分析采用如下材料参数：泊松比0.2695、杨氏模量143.53 GPa[4,5]，由此计算得到S₁ = -1.878×10⁻⁶ MPa⁻¹，1/S₂ = 8.845×10⁻⁶ MPa⁻¹。本研究将11.6 MPa作为无应力材料的应力阈值。应力分析阶段，采用标准拟合方式完成(514)衍射峰的峰位拟合，并将施加应力模式设定为常规模式。压缩测试环节，采用搭载于D8 Advance衍射仪的DEBEN微拉伸台（配备2kN十字头加载机构），加载速率为0.4 mm/min。测试过程中施加的最大应力为20 MPa，扫描速率2°/min，步长0.01°。

搜集汇总

背景与挑战

背景概述

该数据集包含了对不同粒径BiFeO3粉末的X射线衍射研究，重点在于残余应力分析，使用了sin2(psi)方法。实验数据详细记录了衍射仪的操作参数和材料特性，适用于材料科学和物理化学领域的研究。