Structural,mechanicalandsuperconductingpropertiesofBi2Sr2Ca1xYxCu2Oy superconductorswith
various x values(0.00rxr0.50) areinvestigatedbyX-raydiffraction,scanningelectronmicroscopy,
Vickershardnessandresistivitymeasurements.ItisfoundthatthereplacementofCa2þ by Y3þ does
not influencethephasepurityofBi:2212whilelatticeparameters,orthorhombicdistortion,surface
morphology,oxygencontentandholecarrierperCuion(P)areaffected.Furthermore,thecritical
temperatures Tc are increasedbyincreasing Y contentupto0.30,followedbyadecreasewithfurther
increaseof Y contentupto0.50.Thevaluesof Tc are 88,94,101,104and501 K for x¼0.00,0.075,0.15,
0.30 and0.50,respectively.Similarbehaviorisobtainedfortheabsolutevaluesoftruehardness Ht and
surface energy g against Y contentwhiletheoppositebehaviorisrecordedfortheholecarrierperCu
ion (P),deducedfrom Tc values,against Y content.Similarbehaviorisobtainedfortheabsolutevalues
of truehardness Ht and surfaceenergy g against Y content.Theseresultsarediscussedintermsof
possiblereasonsforsuppressionofsuperconductivityby Y substitutionattheCasiteintheBi:2212
superconductingsystem.