xxx
Array
(
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        (
            [id] => 1417
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            [link_rcsr] => 
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            [pressure] => 
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            [e_gap] => 
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            [bulk_mod] => 391.0
            [shear_mod] => 422.5
            [vicker_hard] => 78.4
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
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            [topology] => 4<sup>3</sup>T144
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            [vicker_hard] => 
            [ref_file] => /References/2017_ChemPhysChem_18_873
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            [ref] => 
        )

)
xxx