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TEM Lattice Imaging of the Nanostructure of Early-Growth Sputter-Deposited MoS2 Solid Lubricant Films.

ADA228943

Publication Date	1990
Personal Author	Hilton, M. R.; Fleischauer, P. D.
Page Count	48
Abstract	Transmission electron microscopy (TEM) was used to investigate the nanostructure of sputter-deposited molybdenum disulfide (MoS2) films. These films represent the early stages of growth under deposition conditions that produce a zone 2 columnar morphology. Analysis reveals that the early-growth film morphology consists of anisotropic (platelike) islands in which the (001) basal planes are generally perpendicular to the substrate (forming 'edge islands') or parallel to the substrate (forming 'basal islands'). Within the context of an active-sites nucleation model, localized regions of the substrate surface can lack the active sites needed to induce edge orientation. The edge islands evolve into the zone 2 morphology, shadowing and inhibiting the continued growth of the basal islands. Basal plane (002) lattice image curvature and kinking were observed in the edge islands. Dark-field analysis showed intensity variations within the edge islands. The edge island plates appear to be imperfect crystals of aligned basal planes. These crystals can bend, kink, or twist, apparently because of variations in local growth conditions. The ability of crystal growth to deviate has implications for the morphological evolution of thicker films. The ability of the MoS2 crystal lattice to bend supports the idea that localized deformation can occur during sliding wear. (TTL)
Keywords	Crystal growth Solid lubricants Crystals Deformation Deposition Edges Electron microscopy Environments Evolution(General) Growth(General) Intensity Islands Molybdenum compounds Morphology Orientation(Direction) Parallel orientation Plates Regions Right angles Sites Sliding Sputtering Substrates Sulfides Supports Surfaces Transmittance Variations Wear Molybdenum sulfides Sputter deposition Films
Source Agency	Air Force Non Paid ADAS
NTIS Subject Category	71K - Lubricants & Hydraulic Fluids
Corporate Authors	Aerospace Corp., El Segundo, CA. Lab. Operations.; Space Systems Div., Los Angeles AFS, CA.
Document Type	Technical Report
Title Note	Technical rept.
NTIS Issue Number	199109
Contract Number	F04701-88-C-0089

TEM Lattice Imaging of the Nanostructure of Early-Growth Sputter-Deposited MoS2 Solid Lubricant Films.

TEM Lattice Imaging of the Nanostructure of Early-Growth Sputter-Deposited MoS2 Solid Lubricant Films.
ADA228943

Publication Date	1990
Personal Author	Hilton, M. R.; Fleischauer, P. D.
Page Count	48
Abstract	Transmission electron microscopy (TEM) was used to investigate the nanostructure of sputter-deposited molybdenum disulfide (MoS2) films. These films represent the early stages of growth under deposition conditions that produce a zone 2 columnar morphology. Analysis reveals that the early-growth film morphology consists of anisotropic (platelike) islands in which the (001) basal planes are generally perpendicular to the substrate (forming 'edge islands') or parallel to the substrate (forming 'basal islands'). Within the context of an active-sites nucleation model, localized regions of the substrate surface can lack the active sites needed to induce edge orientation. The edge islands evolve into the zone 2 morphology, shadowing and inhibiting the continued growth of the basal islands. Basal plane (002) lattice image curvature and kinking were observed in the edge islands. Dark-field analysis showed intensity variations within the edge islands. The edge island plates appear to be imperfect crystals of aligned basal planes. These crystals can bend, kink, or twist, apparently because of variations in local growth conditions. The ability of crystal growth to deviate has implications for the morphological evolution of thicker films. The ability of the MoS2 crystal lattice to bend supports the idea that localized deformation can occur during sliding wear. (TTL)
Keywords	Crystal growth Solid lubricants Crystals Deformation Deposition Edges Electron microscopy Environments Evolution(General) Growth(General) Intensity Islands Molybdenum compounds Morphology Orientation(Direction) Parallel orientation Plates Regions Right angles Sites Sliding Sputtering Substrates Sulfides Supports Surfaces Transmittance Variations Wear Molybdenum sulfides Sputter deposition Films
Source Agency	Air Force Non Paid ADAS
NTIS Subject Category	71K - Lubricants & Hydraulic Fluids
Corporate Authors	Aerospace Corp., El Segundo, CA. Lab. Operations.; Space Systems Div., Los Angeles AFS, CA.
Document Type	Technical Report
Title Note	Technical rept.
NTIS Issue Number	199109
Contract Number	F04701-88-C-0089