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Theory of negative thermal expansion.

Tao, Ju-Zhou.

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Theory of negative thermal expansion.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Theory of negative thermal expansion./
作者:	Tao, Ju-Zhou.
面頁冊數:	126 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-11, Section: B, page: 5239.
Contained By:	Dissertation Abstracts International63-11B.
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3069935
ISBN:	0493896422

Theory of negative thermal expansion.
Tao, Ju-Zhou.

Theory of negative thermal expansion. - 126 p.

Source: Dissertation Abstracts International, Volume: 63-11, Section: B, page: 5239.

Thesis (Ph.D.)--Oregon State University, 2003.

Two framework oxide materials of the MO3 network type have been synthesized and structurally characterized by synchrotron and X-ray powder diffraction and the Rietveld method in the temperature range 25 &sim; 500 K. The results show one of them to be a low thermal expansion material.

ISBN: 0493896422Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Theory of negative thermal expansion.
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100 1 $a Tao, Ju-Zhou. $3 1948940
245 1 0 $a Theory of negative thermal expansion.
300 $a 126 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-11, Section: B, page: 5239.
500 $a Adviser: Arthur W. Sleight.
502 $a Thesis (Ph.D.)--Oregon State University, 2003.
520 $a Two framework oxide materials of the MO3 network type have been synthesized and structurally characterized by synchrotron and X-ray powder diffraction and the Rietveld method in the temperature range 25 &sim; 500 K. The results show one of them to be a low thermal expansion material.
520 $a Theoretical studies of negative thermal expansion (NTE) in framework oxides were conducted with two methods, geometrical modeling by Rigid Unit Mode (RUM) method and lattice dynamic calculations by free energy minimization (FEM) method, the results are compared with each other as well as with experimental observations.
520 $a RUM analysis of all five types of framework oxide structures negates any simple and direct correlation between presence or absence of RUMs in a structure and the sign of its thermal expansion. Instead, results suggest that NTE of a crystalline solid can not be explained by pure geometrical considerations over its structure alone, and for a better understanding of structure-relationship in negative thermal expansion structures, specific interatomic interactions present in each one must be brought in explicitly.
520 $a FEM calculation of two negative thermal expansion structures indicates on a structure by structure basis NTE could be predicted and understood within the Gruneisen model, which attributes NTE of a structure to special vibration modes in a structure that softens when the lattice shrinks. The soft NTE modes are, however, not necessarily RUM or RUM like vibration motions.
590 $a School code: 0172.
650 4 $a Chemistry, Inorganic. $3 517253
690 $a 0488
710 2 0 $a Oregon State University. $3 625720
773 0 $t Dissertation Abstracts International $g 63-11B.
790 1 0 $a Sleight, Arthur W., $e advisor
790 $a 0172
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3069935