Lect26_notes

27 ceramics semiconductors and geological samples

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Unformatted text preview: xcept 6061): –  97H2O-1.5 HNO3-1HCL-0.5HF –  15 to 20 sec. •  Ti: –  Kroll's: 95H2O-4HNO3-1HF –  15 to 20 sec. CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 25 Insulating Samples! ! ! ! ! ! ! •  Either - examine at low kV –  Finding the balance such that Ip = Ise + Ibs •  Coating with a conducting layer –  Gold, gold palladium by evaporation •  Grain size issue •  EDS issue –  Sputtering carbon, chromium, irridium etc. CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 26 Preparation for Microanalysis! ! ! ! ! ! ! •  Artifacts from polishing media •  Artifacts from e.g. gold coating •  Quantitative microanalysis requires a perfectly flat specimen –  Or ZAF corrections become erroneous •  Polishing multiphase materials can lead to unwanted topography CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 27 Ceramics, Semiconductors and Geological Samples! ! ! ! ! ! ! •  Similar to metals - but these materials are typically insulating •  An added possibility for cross sections is FIB (Focussed ion beam machining) –  But careful mounting with appropriate fixtures enables cross sections to be prepared CBEMS 164 –...
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This note was uploaded on 01/16/2014 for the course CBEMS 164 taught by Professor Porter,j during the Fall '08 term at UC Irvine.

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