Joao vitor Campos

6 Questions 14 Answers 0 Followers

Questions related from Joao vitor Campos

Where can I find the R-factor expected in GSASII (Rexp)?

Hello! I just started to use GSASII and I am having trouble to find Rexp after refinement. I see on the tab covariance GOF (goodness of fit), wR (Rwp), but I cannot find Rexp. Can you help...

01 October 2021 9,680 0 View

How to do Rietveld refinement with HT-XRD (High temperature X ray diffraction) data?

Hello colleagues. I am analyzing some phase transitions during heat treatment of calcium phosphate materials. Although I am having trouble to fit the data properly. I am using profex, and I an...

16 February 2021 1,296 4 View

What is the most fundamental difference between grain boundary and crystallite boundary?

I've seen often in TEM micrography grains within many crystallites, I am wondering what is the difference between the boundary between the crystallites of the same grain to the grain boundary. I...

22 December 2020 6,416 6 View

Why after a long sintering dwell time some porosity "appears" at my sample?

I've sintered 3YSZ at 1450 ºC for 21 h and the microstructure was fine, medium size grains and almost no porosity. Then I've sintered the same 3YSZ at 1450 ºC for 50 h and the grains were bigger...

04 February 2019 1,708 12 View

If I apply electric field at 3YSZ using two platinum electrode discs it will polarize my material?

Hi, I am applying electric field at the flat surface of a 3YSZ cylindrical sample (3%mol yttria stabilized zirconia) in a sandwich setup (platinum electrode - 3YSZ - another platinum electrode),...

09 January 2019 6,138 8 View

How can I measure the condutivity (or resistivity) vs temperature of the zirconia samples? Should I apply a field and measure the current?

I am trying to measure the resistance of the zirconia in many temperatures (25-1000ºC), someone have any ideas to make this measurement in a reliable way? Thank you!

27 February 2018 9,870 2 View