《Table 2 Oxygen and carbon contents in the selected HEB powders》

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《硼热/碳热还原技术制备高致密度、高纯度高熵硼化物陶瓷（英文）》

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The morphology of the HEB powders synthesized with various amounts of B4C additions at 1800°C is presented in Fig.3e and Fig.S2e–g.Slight difference in morphology can be seen from these images，i.e.，necking is prone to take place in the powders synthesized at higher temperature and/or with more B4C additions.The average particle size of HEB1-18，HEB2-18，HEB3-18，and HEB4-18 powders is 0.35±0.07，0.38±0.10，0.44±0.12，and0.63±0.15μm，respectively.Fig.4 presents the high resolution TEM（HRTEM）images of the HEB3-13 and HEB3-18 powders，both of which are well crystalline.The interplanar distances of HEB3-13 match well with those ofplanes of SS1（0.208 and 0.154 nm，from XRD patterns）.The interplanar distances of HEB3-18 match well with those of（100）andplanes（0.269and 0.210 nm，from XRD patterns）in HEB with Al B2structure.