Heavy ion bombardment of monoclinic thsio₄, tho₂and monazite

Plutonium incorporation in phosphate and titanate ceramics for minor actinide containment

“…Zirconolite is almost completely amorphized after sustaining an integrated alpha dose of about 4 · 10 18 g À1 ; recrystallization of the monoclinic structure occurs above 773 K. The amorphization process has never been observed in natural monazite [21], but has been reported for monazite subjected to external irradiation; recrystallization of these samples occurred at relatively low temperatures (about 573 K) [22]. Burakov [4] reported that the increase of the 238 Pu content in monazite structured solid solutions will decrease the resistance of monazite to self-irradiation.…”

Pb diffusion in monazite: a combined RBS/SIMS study

“…For synthetic LaPO 4 , the threshold temperature is as low as 60°C. Totally amorphous monazite is completely recrystallized by laboratory heating to 300°C (Karioris et al, 1981). Electron irradiation produced during alpha decay may be an efficient way to anneal metamict monazite (Meldrum et al, 1997a).…”

Microstructural dependence of the thermal and mechanical properties of monazite LnPO4 (Ln=La to Gd)

“…E, G and ν for LnPO 4 (Ln = La, Pr, Nd or Eu) have been calculated using Eqs. (4)- (6). Experimental data of the elastic moduli are shown in Fig.…”

“…5 Moreover, the monazite structure can anneal the self-irradiation defects at a relatively low temperature. 6 Another remarkable property of monazite, which makes this material very interesting to be used as a nuclear waste matrix, is its low solubility in water. 7 Despite monazite compounds have been shown as potential radionuclides matrices, complementary studies are necessary to complete the database of those compounds, in particular concerning their mechanical and thermal properties that are important for the concerned application.…”