東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

NMR study of paramagnetic nano-check...

Maher, Christopher Andrew.

FindBook

Google Book

Amazon

博客來

NMR study of paramagnetic nano-checkerboard superlattices.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	NMR study of paramagnetic nano-checkerboard superlattices./
作者:	Maher, Christopher Andrew.
面頁冊數:	138 p.
附註:	Source: Dissertation Abstracts International, Volume: 73-07(E), Section: B.
Contained By:	Dissertation Abstracts International73-07B(E).
標題:	Physics, Solid State. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3501900
ISBN:	9781267238078

NMR study of paramagnetic nano-checkerboard superlattices.
Maher, Christopher Andrew.

NMR study of paramagnetic nano-checkerboard superlattices. - 138 p.

Source: Dissertation Abstracts International, Volume: 73-07(E), Section: B.

Thesis (Ph.D.)--The College of William and Mary, 2012.

With the ubiquity of electronic devices, finding ways to improve quality or fabrication methods of components is an important area of study. This dissertation looks at two sets of materials that may be used to address this need. The first is a series of disordered perovskites of the form Nd&frac23;--xLi3 xTiO3. These materials are notable for the way the lithium becomes spontaneously patterned during synthesis into square planar regions, the dimensions of which are only dependent upon the initial concentration of lithium. Through the use of point-charge calculations, the paramagnetic and first-order quadrupole interaction tensors for each of the 28 unique lithium sites of the x = 0.083 concentration were calculated and used to accurately simulate the experimental spectra. From this, it was observed that the 28 crystallographically distinct sites present in that particular concentration could be grouped into three sets based on the principal values of the paramagnetic interaction tensors. Qualitative analysis of spectra from the other concentrations suggests that this grouping holds for other concentrations, with only the relative number of sites in each group changing. Additionally, jump dynamics were incorporated into the simulations of one of the sites in order to explain the broadening that occurs at lower temperatures.

ISBN: 9781267238078Subjects--Topical Terms:

1669244
Physics, Solid State.

NMR study of paramagnetic nano-checkerboard superlattices.
LDR:03435nam a2200277 4500 001 1960920
005 20140701144845.5
008 150210s2012 ||||||||||||||||| ||eng d
020 $a 9781267238078
035 $a (MiAaPQ)AAI3501900
035 $a AAI3501900
040 $a MiAaPQ $c MiAaPQ
100 1 $a Maher, Christopher Andrew. $3 1924326
245 1 0 $a NMR study of paramagnetic nano-checkerboard superlattices.
300 $a 138 p.
500 $a Source: Dissertation Abstracts International, Volume: 73-07(E), Section: B.
500 $a Adviser: Gina Hoatson.
502 $a Thesis (Ph.D.)--The College of William and Mary, 2012.
520 $a With the ubiquity of electronic devices, finding ways to improve quality or fabrication methods of components is an important area of study. This dissertation looks at two sets of materials that may be used to address this need. The first is a series of disordered perovskites of the form Nd&frac23;--xLi3 xTiO3. These materials are notable for the way the lithium becomes spontaneously patterned during synthesis into square planar regions, the dimensions of which are only dependent upon the initial concentration of lithium. Through the use of point-charge calculations, the paramagnetic and first-order quadrupole interaction tensors for each of the 28 unique lithium sites of the x = 0.083 concentration were calculated and used to accurately simulate the experimental spectra. From this, it was observed that the 28 crystallographically distinct sites present in that particular concentration could be grouped into three sets based on the principal values of the paramagnetic interaction tensors. Qualitative analysis of spectra from the other concentrations suggests that this grouping holds for other concentrations, with only the relative number of sites in each group changing. Additionally, jump dynamics were incorporated into the simulations of one of the sites in order to explain the broadening that occurs at lower temperatures.
520 $a The second study included in this dissertation is focused on lithium in a pair of high-dielectric microwave ceramics, Ca(Li1/3Nb 2/3)O3 and (Ca2/3La1/3)(Li1/3 Nb2/3)O3. Experimental results are reported for the temperature-dependence of both the spin-lattice relaxation rate and the isotropic chemical shift for each material. For both samples, the isotropic shift was linear with temperature, with the isotropic shift of Ca(Li 1/3Nb2/3)O3 having a stronger temperature dependence (3.53 Hz·K-1 compared to 2.65 Hz·K -1). The spin-lattice relaxation rates of both samples follow an Arrhenius relationship with temperature, with Ca(Li1/3Nb 2/3)O3 sample having an activation energy of 5.08 kJ · (mol · K)-1 and (Ca2/3La1/3)(Li 1/3Nb2/3)O3 having an activation energy of 2.21kJ · (mol · K)-1. In addition to the lithium study, there were also spectra acquired that observed the niobium nucleus in each material, which has a noticeably more complex spectrum. For the (Ca2/3 La1/3)(Li1/3Nb2/3)O3 sample, a double-quantum satellite-transition magic angle spinning pulse sequence was used to determine the isotropic chemical shift as well as the quadrupole product of each of the five resolved sites.
590 $a School code: 0261.
650 4 $a Physics, Solid State. $3 1669244
690 $a 0600
710 2 $a The College of William and Mary. $3 1018629
773 0 $t Dissertation Abstracts International $g 73-07B(E).
790 $a 0261
791 $a Ph.D.
792 $a 2012
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3501900