Investigation of the microstructure in the YttriumTantalateZirconia system

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Investigation of the microstructure in the Yttrium-Tantalate-Zirconia system Thursday, August 27, 2015

Investigation of the microstructure in the Yttrium-Tantalate-Zirconia system Thursday, August 27, 2015

Yttrium-Tantalate-Zirconia system

Yttrium-Tantalate-Zirconia system

Thermal conductivities of the system Very low thermal conductivities (< 2 Wm-1 K-1)

Thermal conductivities of the system Very low thermal conductivities (< 2 Wm-1 K-1)

Quasi-binary phase diagram 3 phases in the 30 to 60 mol % Zr. O

Quasi-binary phase diagram 3 phases in the 30 to 60 mol % Zr. O 2 region?

Phases of YTa. O 4 Transition takes place at 1475 °C for pure YTa.

Phases of YTa. O 4 Transition takes place at 1475 °C for pure YTa. O 4

Imaging techniques used • Transmission Electron Microscopy • Scanning Electron Microscopy

Imaging techniques used • Transmission Electron Microscopy • Scanning Electron Microscopy

Transmission Electron Microscopy at the Center for Nanoscale Systems (CNS) JEOL 2100 TEM

Transmission Electron Microscopy at the Center for Nanoscale Systems (CNS) JEOL 2100 TEM

Inside a TEM

Inside a TEM

Requirements for TEM • Sample has to be very thin (<100 nm) • Hence

Requirements for TEM • Sample has to be very thin (<100 nm) • Hence specific technique to prepare samples 1. Hand polishing and ion milling 2. Focused Ion beam

Sample Preparation • Chosen method was hand polishing and ion milling • Started from

Sample Preparation • Chosen method was hand polishing and ion milling • Started from discs and cut cross section • Polish down to about 100 m

Dimpling Grinder Fischione Model 200 Dimpling Grinder

Dimpling Grinder Fischione Model 200 Dimpling Grinder

Ion milling • Trickiest part in sample preparation • Sputtering of molybdenum on the

Ion milling • Trickiest part in sample preparation • Sputtering of molybdenum on the sample Gatan Model 691 Precision Ion Polishing System

Finding a recipe that works Fischione Model 1010 Ion mill

Finding a recipe that works Fischione Model 1010 Ion mill

New equipement CNS bought Fischione Model 1050 TEM mill

New equipement CNS bought Fischione Model 1050 TEM mill

Contacting an expert Contact Rocco Cerchiara, TEM sample preparation expert from Fischione, to ask

Contacting an expert Contact Rocco Cerchiara, TEM sample preparation expert from Fischione, to ask for a possible recipe for ion milling Suggested using high angles and low energy to remove molybdenum being sputtered

Ready for Imaging!!! Double tilt Beryllium sample holder

Ready for Imaging!!! Double tilt Beryllium sample holder

TEM Image of 50 mol % Zr. O 2

TEM Image of 50 mol % Zr. O 2

HRTEM Image of 50 mol % Zr. O 2

HRTEM Image of 50 mol % Zr. O 2

Selected area electron diffraction of 50 mol % Zr. O 2

Selected area electron diffraction of 50 mol % Zr. O 2

SEM Image of 50 mol % Zr. O 2

SEM Image of 50 mol % Zr. O 2

SEM Image of 50 mol % Zr. O 2 cross section Probably bands seen

SEM Image of 50 mol % Zr. O 2 cross section Probably bands seen on previous SEM image?

Concluding remarks Finally find a good recipe for sample preparation but not enough time

Concluding remarks Finally find a good recipe for sample preparation but not enough time to complete observations!!! Bands structure in 50 mol % Zr. O 2 possibly due to the fact that this composition is very close to the eutectoid composition

Any Questions ?

Any Questions ?

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