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Structural, transport, and magnetic ...

Johnson, Donald E.

Structural, transport, and magnetic properties of A-site substituted perovskite manganites.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Structural, transport, and magnetic properties of A-site substituted perovskite manganites.
作者:	Johnson, Donald E.
面頁冊數:	84 p.
附註:	Source: Masters Abstracts International, Volume: 50-02, page: 1086.
附註:	Adviser: Bogdan Dabrowski.
Contained By:	Masters Abstracts International50-02.
標題:	Physics, Condensed Matter.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1498778
ISBN:	9781124871189

Structural, transport, and magnetic properties of A-site substituted perovskite manganites.
Johnson, Donald E.

Structural, transport, and magnetic properties of A-site substituted perovskite manganites. - 84 p.

Source: Masters Abstracts International, Volume: 50-02, page: 1086.

Thesis (M.S.)--Northern Illinois University, 2011.

Perovskite manganites, AMnO3, have been an interesting avenue for studying magnetic, resistive, and thermoelectric properties since they are strongly correlated to the crystal structure tunable by selection of charges and sizes of the A-site ions. In this study several unique systems with tolerance factor, t > 1 has been successfully obtained for A = La, Nd, Ba and Sr by development of novel synthesis procedure. These systems predicted to be cubic have a unique behavior since properties are predominately controlled by the change of the [Mn-O] bond length, which is stretched beyond the equilibrium value. X-ray, neutron diffraction, and thermogravimetric measurements confirmed achievement of the desired compounds with A-site cationic disorder and order, respectively. Unexpectedly, compositions with the largest t have been found non-cubic, which may indicate noteworthy distortions of the MnO6 octahedra that warrants detailed future studies of structural and ferroelectric properties. Physical property measurements have confirmed the expected suppression of the magnetic transition temperatures and the insulating properties. Comparison of the A-site ordered with disordered materials of the same chemical compositions showed remarkable increase of the Curie transition temperatures.

ISBN: 9781124871189Subjects--Topical Terms:

226939
Physics, Condensed Matter.

Structural, transport, and magnetic properties of A-site substituted perovskite manganites.
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502 $a Thesis (M.S.)--Northern Illinois University, 2011.
520 $a Perovskite manganites, AMnO3, have been an interesting avenue for studying magnetic, resistive, and thermoelectric properties since they are strongly correlated to the crystal structure tunable by selection of charges and sizes of the A-site ions. In this study several unique systems with tolerance factor, t > 1 has been successfully obtained for A = La, Nd, Ba and Sr by development of novel synthesis procedure. These systems predicted to be cubic have a unique behavior since properties are predominately controlled by the change of the [Mn-O] bond length, which is stretched beyond the equilibrium value. X-ray, neutron diffraction, and thermogravimetric measurements confirmed achievement of the desired compounds with A-site cationic disorder and order, respectively. Unexpectedly, compositions with the largest t have been found non-cubic, which may indicate noteworthy distortions of the MnO6 octahedra that warrants detailed future studies of structural and ferroelectric properties. Physical property measurements have confirmed the expected suppression of the magnetic transition temperatures and the insulating properties. Comparison of the A-site ordered with disordered materials of the same chemical compositions showed remarkable increase of the Curie transition temperatures.
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