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A coupled magnetostructural transition (MST) from a high-temperature low-magnetic -type hexagonal phase to a low-temperature high-magnetic -type orthorhombic phase, and the associated large magnetocaloric effect, are explored for the system. Room-temperature structural analysis is carried out to investigate the orthorhombic distortion of the hexagonal phase initiated by introducing at the site. The indirect isothermal magnetic measurement technique is employed to estimate the magnetocaloric effect across the coupled phase transition. Fascinatingly, a relatively large value of isothermal magnetic entropy change (Δ) of (−12.02 ± 0.34) J  at (332.5 ± 0.2) K and relative cooling power (RCP) of (119.6 ± 3.5) J  is achieved for the composition , for a field change of 30 kOe. The complex hysteresis behavior around the phase …