X-Ray Properties of AGN in Brightest Cluster Galaxies. I. A Systematic Study of the <i>Chandra</i> Archive in the 0.2 &lt; <i>z</i> &lt; 0.3 and 0.55 &lt; <i>z</i> &lt; 0.75 Redshift Range
Astrophysical journal/The Astrophysical journal