Hi
We have for now 5 years an HTK12 (1200°C maximum) with a MPD + X’Cellerator.
This is really a nice ‘combinaison’, with new fast detectors
(X’Cellerator, Vantec …..) you can have a nice counting statistic in few
minutes (15-25 minutes).
Recently I have explore the WO3 phase transitions as a school case for
second order phase transitions, from RT to 930°C in 22 Hours Step in
temperature 25°C (37 temperatures scanned) measured from 12 to 90° (2
theta).
It gives very large counting I Max 160000 for the more symmetric
compound at 930°C.
/I can send the data if asked./
I order to increase the intensity, we use larger slits (manual divergent
slit 0.5°/1° and also larger Sollers Slit 0.04° instead of the usual
0.02°).
The thermal linearity of the HTK12 is really good, test with some Y2O3
from 20 to 1200°C during the testing phase, the homogeneity is also
really good this is a furnace not a strip. Calibration of the
temperature is not so evident for really precise value, but new in
models the thermocouple is closer to the sample.
In our lab, for few years the furnace was used during single nights,
mounting time (10 to 15 minutes).
If, you can tested your system, Y2O3 is really nice.
Leopoldo Suescun wrote:
Hi,
May I ask your help with this not specifically Rietveld-related question?
I'm helping a colleague buy a new powder diffractometer with high
temperature attachment but I myself have little experience with this
particular attachment.
I'd appreciate if anyone could comment on the three most popular Rigaku,
Panalytical and Bruker systems that offer these attachments. Mainly:
simplicity of operation/mounting, temperature stability, typical data
collection speeds (comparing Rietveld quality data in a typical range
20-120 with/without high-T chamber) and price/value relation.
He's on a hurry so comments are welcome and will be useful before Wednesday.
Thanks in advance for your kind help.
Leo
--
Dr. François Goutenoire
Maître de Conférences, IUT Le Mans
Laboratoire des Oxydes et Fluorures, UMR6010
Avenue Olivier Messiaen,
72085 Le Mans, Cedex 9
