Knoop microhardness measurements were made on single crystals of hexa- and tetraborides of lanthanides and actinides prepared by the solution-melt method, Polar and reticular anisotropy of the microhardness was established (P=20 g), The highest polar anisotropy was observed for NdB6 (410 kg/mm(2)) and for SmB4 (760 kg/mm(2)), The highest reticular anisotropy was observed for SmB6 (620 kg/mm(2)) and for HoB4 (1120 kg/mm(2)), To explain the microhardness anisotropy, a new criterion of inverse density of atoms in a layer within a unit cell (unit volume of identity in the crystal structure or in a block of layers in the crystal structure) was proposed, It was found that the inverse density of metal or boron atoms in a layer correlates with the reticular and polar microhardness anisotropy of hexa- and tetraborides of lanthanides and actinides. (C) 1997 Academic Press. [References: 9]
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机译：对通过溶液熔融法制备的镧系元素的六和四硼化物和ides系元素的单晶进行努氏显微硬度测量，建立了显微硬度的极坐标和网状各向异性（P = 20 g），观察到最高的各向异性为NdB6（ 410 kg / mm（2））和SmB4（760 kg / mm（2）），对于SmB6（620 kg / mm（2））和HoB4（1120 kg / mm（2））观察到最高的网状各向异性为了解释显微硬度各向异性，提出了一个新的准则来反驳晶胞内层中原子的逆密度（晶体结构或晶体结构中层的单位体积的单位体积），发现层中金属或硼原子的反密度与镧系元素和act系元素的六硼和四硼化物的网状和极性显微硬度各向异性相关。 （C）1997学术出版社。 [参考：9]
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