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The response of the pyrochlore struc...

Lian, Jie.

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The response of the pyrochlore structure-type to ion-beam irradiation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The response of the pyrochlore structure-type to ion-beam irradiation./
作者:	Lian, Jie.
面頁冊數:	131 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2891.
Contained By:	Dissertation Abstracts International64-06B.
標題:	Engineering, Nuclear. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3096141

The response of the pyrochlore structure-type to ion-beam irradiation.
Lian, Jie.

The response of the pyrochlore structure-type to ion-beam irradiation. - 131 p.

Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2891.

Thesis (Ph.D.)--University of Michigan, 2003.

Pyrochlore with the general formula of A3+2B4+2O7 (Fd3m; Z = 8) has been proposed as the candidate waste form for the immobilization of actinides, particularly plutonium from dismantled nuclear weapons. Because actinides decay by alpha-decay events, radiation effects on the waste form are a concern. The effects of radiation on different pyrochlore compositions, A2B2O7 (A = La &sim; Lu, and Y; B = Ti, Sn, and Zr), have been investigated by 50 KeV He+, 600 KeV Ar+, 1.0 MeV Kr+, and 1.5 MeV Xe+ ion irradiations.Subjects--Topical Terms:

1043651
Engineering, Nuclear.

The response of the pyrochlore structure-type to ion-beam irradiation.
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245 1 4 $a The response of the pyrochlore structure-type to ion-beam irradiation.
300 $a 131 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-06, Section: B, page: 2891.
500 $a Chairs: Rodney C. Ewing; Lu-Min Wang.
502 $a Thesis (Ph.D.)--University of Michigan, 2003.
520 $a Pyrochlore with the general formula of A3+2B4+2O7 (Fd3m; Z = 8) has been proposed as the candidate waste form for the immobilization of actinides, particularly plutonium from dismantled nuclear weapons. Because actinides decay by alpha-decay events, radiation effects on the waste form are a concern. The effects of radiation on different pyrochlore compositions, A2B2O7 (A = La &sim; Lu, and Y; B = Ti, Sn, and Zr), have been investigated by 50 KeV He+, 600 KeV Ar+, 1.0 MeV Kr+, and 1.5 MeV Xe+ ion irradiations.
520 $a Titanate pyrochlores are generally sensitive to ion beam damage and can be amorphized at a low damage level (&sim;0.2 dpa). The critical amorphization temperature, Tc, increases from &sim;480 to &sim;1120 K with increasing A-site cation size. A dramatically increasing radiation "resistance" to ion beam induced-amorphization has been observed with increasing Zr-content in the Gd2Ti2-xZrxO7 system. The pure end-member, Gd2Zr2O7, cannot be amorphized, even at doses as high as &sim;100 dpa. Although zirconate pyrochlores are generally considered to be radiation "resistant", ion beam-induced amorphization occurs for La2Zr2O7 at a dose of &sim;5.5 dpa at room temperature. Stannate pyrochlores A2Sn 2O7 (A = La, Nd, Gd) are readily amorphized by ion beam damage at a relatively low dose (&sim;1 dpa) at room temperature; while no evidence of amorphization has been observed in A2Sn2O7 (A = Er, Y, Lu) irradiated with 1 MeV Kr+ ions at a dose of &sim;6 dpa at 25 K.
520 $a The factors that influence the response of different pyrochlore compositions to ion irradiation-induced amorphization are discussed in terms of cation radius ratio, defect formation energies, and the tendency of the pyrochlore structure-type to undergo an order-disorder transition to the defect-fluorite structure. The "resistance" of the pyrochlore structure to ion beam-induced amorphization is not only affected by the relative sizes of the A- and B-site cations, but also the cation electronic configurations. Pyrochlore compositions that have larger structural deviations from the ideal fluorite structure are more sensitive to ion beam-induced amorphization. These fundamental results provide insight into the structural and compositional controls on radiation-induced amorphization of pyrochlores. This understanding can be used for the design and selection of materials used for the immobilization of actinides.
590 $a School code: 0127.
650 4 $a Engineering, Nuclear. $3 1043651
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Physics, Condensed Matter. $3 1018743
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710 2 0 $a University of Michigan. $3 777416
773 0 $t Dissertation Abstracts International $g 64-06B.
790 1 0 $a Ewing, Rodney C., $e advisor
790 1 0 $a Wang, Lu-Min, $e advisor
790 $a 0127
791 $a Ph.D.
792 $a 2003
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