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Mn_(3)Ag_((1-x))Cu_((x))N antiperovskite thin films with ultra-low temperature coefficient of resistance

Journal of Materials Science & Technology 2022年第4期99卷 138-147页

作者： cecil cherian lukose Guillaume Zoppi Martin Birkett Faculty of Engineering and Environment Northumbria UniversityNewcastle upon Tyne NE18STUnited Kingdom

We demonstrate the first successful attempt to partially substitute Cu into the Mn_(3)AgN-antiperovskite system to form Mn_(3)Ag_((1-x))Cu_((x))N thin films with an ultra-low temperature coefficient of resistance(TCR)for fabrication of ultra-precise passive components.Films were grown by reactive magnetron sputtering on alumina and glass substrates and were found to be amorphous in nature with highly negative TCR of-233 to-351 ppm/℃in their as-grown state.Increasing Cu alloying from x=0 to 1,resulted in increased sheet resistance,a negative shift of TCR and a change of grain morphology from spherical to elongated.Post-deposition heat treatment at 300-375℃,resulted in a positive shift of TCR and an ultra-low TCR of-4.66 ppm/℃for films with x=0.6.The heat treatment induces grain growth,surface roughness and the formation of a manganese oxide upper surface layer up until temperatures of 350℃,after which surface oxidation begins to dominate.The growth rate of the surface layer is controlled by the Cu concentration and heat treatment temperature,which both play a central role in the development of these novel ultralow TCR Mn_(3)Ag_((1-x))Cu_((x))N thin film structures.

关键词： Antiperovskite Thin film Sputter deposition Annealing Surface oxidation Near-zero temperature coefficient of resistance

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Thermal activation of Ti_((1-x))Au_((x))thin films with enhanced hardness and biocompatibility

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Bioactive Materials 2022年第9期7卷 426-445页

作者： cecil cherian lukose Ioannis Anestopoulos Theodora Mantso Leon Bowen Mihalis I.Panayiotidis Martin Birkett Department of Mechanical and Construction Engineering Northumbria UniversityNewcastle Upon TyneUK Department of Cancer Genetics Therapeutics&Ultrastructural PathologyThe Cyprus Institute of Neurology and GeneticsNicosiaCyprus The Cyprus School of Molecular Medicine The Cyprus Institute of Neurology and GeneticsNicosiaCyprus Department of Applied Sciences Northumbria UniversityNewcastle Upon TyneUK Department of Physics G.J.Russell Microscopy FacilityDurham UniversityDurhamUK

The lifetime of orthopaedic implants can be extended by coating the softer Ti6Al4V alloy with harder biocompatible thin films.In this work,thin films of Ti_((1-x))Au_((x))are grown on Ti_(6)Al_(4)V and glass substrates by magnetron sputtering in the entire x=0-1 range,before their key biomechanical properties are performance tuned by thermal activation.For the first time,we explore the effect of in-situ substrate heating versus ex-situ post-deposition heat-treatment,on development of mechanical and biocompatibility performance in Ti-Au films.A~250% increase in hardness is achieved for Ti-Au films compared to bulk Ti6Al4V and a~40%improvement from 8.8 GPa as-grown to 11.9 and 12.3 GPa with in-situ and ex-situ heat-treatment respectively,is corelated to changes in structural,morphological and chemical properties,providing insights into the origins of super-hardness in the Ti rich regions of these materials.X-ray diffraction reveals that as-grown films are in nanocrystalline states of Ti-Au intermetallic phases and thermal activation leads to emergence of mechanically hard Ti-Au intermetallics,with films prepared by in-situ substrate heating having enhanced crystalline quality.Surface morphology images show clear changes in grain size,shape and surface roughness following thermal activation,while elemental analysis reveals that in-situ substrate heating is better for development of oxide free Ti3Auβ-phases.All tested Ti-Au films are non-cytotoxic against L929 mouse fibroblast cells,while extremely low leached ion concentrations confirm their biocompatibility.With peak hardness performance tuned to>12 GPa and excellent biocompatibility,Ti-Au films have potential as a future coating technology for load bearing medical implants.

关键词： Ti-Au thin film coating Hardness Biocompatible L929 mouse fibroblast Implants

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