Array
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        (
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            [name] => 
            [pressure] => 
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            [shear_mod] => 356.8
            [vicker_hard] => 62.7
            [ref_file] => 
            [publ_year] => 
            [ref] => 
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    [1] => Array
        (
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            [e_gap] => Metal
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    [3] => Array
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            [energy] => 
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            [shear_mod] => 372
            [vicker_hard] => 60.6
            [ref_file] => /References/2016_AIPAdvance_055020
            [publ_year] => 2016
            [ref] => 
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)