ملخص
Tin- and titanium-doped α-Cr2O3 have been prepared by the calcination of precipitates. Rietveld structure refinement of the X-ray powder diffraction patterns shows that the dopant metals occupy interstitial sites and partially substitute on octahedral chromium sites in the corundum-related α-Cr2O3 structure. Interatomic potential calculations show that such defects are energetically more favourable than the exclusive substitution of chromium or the occupation by the dopant of interstitial sites in α-Cr2O3 with charge balance being achieved by an appropriate number of cation vacancies. However, the attempted incorporation of magnesium within α-Cr2O3 results in the formation of spinel-related MgCr2O4. The observation is rationalised in terms of the greater thermodynamic stability of the spinel-related structure.
اللغة الأصلية | English |
---|---|
الصفحات (من إلى) | 141-145 |
عدد الصفحات | 5 |
دورية | Solid State Communications |
مستوى الصوت | 123 |
رقم الإصدار | 3-4 |
المعرِّفات الرقمية للأشياء | |
حالة النشر | Published - يوليو 2002 |
منشور خارجيًا | نعم |
ASJC Scopus subject areas
- ???subjectarea.asjc.1600.1600???
- ???subjectarea.asjc.3100.3104???
- ???subjectarea.asjc.2500.2505???