Petru Lunca-Popa

7 Questions 16 Answers 0 Followers

Questions related from Petru Lunca-Popa

What is wrong with my XRD Brucker D8?

Hello everyone 2-3 months I start getting weird XRD diffractograms. I was performing locked couple analysys on some polycrsitalline films. I am analysing those films for years so I know them quite...

21 February 2022 1,619 6 View

How measure absolute reflectance using a reference mirror?

Hello I am measuring the reflectance of some coatings using a Perkin Elmer spectro (lamda 950). In order to increase the precision I bought (from PE also) a Al reference mirror. It cames with a CD...

09 January 2018 8,602 1 View

Can the Rietveld analyis be performed on DRX scan acquired in Grazing Incidence?

I am a very newbie in this Rietveld analysis. I am trying to fit my XRD pattern using (for a polycrystalline film) a CIF file. I know I am off stochiometry and I am sure my cell is deformed....

07 November 2016 4,609 7 View

What is the correct band gap determined by a Tauc plot?

I am having a Tauc plot showing two liniar segments. My question is related to the last liniar portion which is interesecting the x axis. I know the Band gap is obtained by extrapolating the last...

07 November 2015 3,847 12 View

Can anyone help with a XRD Brucker D8 alignment problem?

Recently I switch on Brucker diffractometer (previously worked on Philips) and I am having a problem with alignment. It worked perfect until last week when something happened (possible...

01 October 2014 331 18 View

Can you recommend and oxygen compatible precursors for borane for MOCVD?

Trying to avoid the use of diborane as precursor for B I am looking for alternative precursors. Essays with Tri isopropyl, 3 etyl and tert buthyl Borate didnt give good results. Also the use of...

28 August 2014 1,341 5 View

Absorptance of a transparent thin film on a thick glass?

For normal incidence of light can we really neglect the reflected light (in a spectrometer using an integrating sphere).

21 January 2014 1,445 6 View