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The role of slight changes of the chemical composition on antiferromagneticordering of Cr in rare-earth orthochoromites was investigated on a series ofceramic solid-solutions Ce$_{1-x}$Eu${_x}$O$_3$ where x varied from 0 to 1.Gradual replacement of Ce with Eu reduces the cell volume and acts equivalentlyto applying external pressure. Full replacement of Ce by Eu, on the other hand,reduces the N\'{e}el temperature from 260 K for CeCrO$_3$ to 178 K forEuCrO$_3$ as established by magnetization, heat capacity and neutron powderdiffraction measurements. High resolution x-ray powder diffraction measurementson Ce$_{1-x}$Eu${_x}$O$_3$ and neutron powder diffraction studies on CeCrO$_3$enable to correlate the magnetic properties of the Cr magnetic subsystem withthe size of the lattice and minute changes of the bonding and torsion angleswithin and between the CrO$_6$ octahedra. We find that the sizes and the shapesof the CrO$6$ octahedra remain essentially unchanged as the size of therare-earth cations is reduced whereas decreasing Cr - O - Cr bonding angles andincreasing inclination of neighboring octahedra enable to compensate for thedecreasing lattice size.

Impact of Rare-earth site Substitution on the Structural, Magnetic and Thermal Properties of Ce$_{1-x}$Eu$_x$CrO$_3$ Orthochromite Solid-solutions