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Synthesis, structure and magnetic pr...

Rogado, Nyrissa S.

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Synthesis, structure and magnetic properties of low dimensional spin systems in the 3d transition metal oxides and superconductivity in magnesium borate.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Synthesis, structure and magnetic properties of low dimensional spin systems in the 3d transition metal oxides and superconductivity in magnesium borate./
作者:	Rogado, Nyrissa S.
面頁冊數:	142 p.
附註:	Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2186.
Contained By:	Dissertation Abstracts International64-05B.
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3089880

Synthesis, structure and magnetic properties of low dimensional spin systems in the 3d transition metal oxides and superconductivity in magnesium borate.
Rogado, Nyrissa S.

Synthesis, structure and magnetic properties of low dimensional spin systems in the 3d transition metal oxides and superconductivity in magnesium borate. - 142 p.

Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2186.

Thesis (Ph.D.)--Princeton University, 2003.

The major part of this thesis deals with the synthesis and magnetic characterization of low dimensional spin systems in the 3d transition metal oxides. Such systems are of interest due to the simplicity of their structures, allowing theoretical modeling of their electronic and magnetic behavior. Exotic properties are also often encountered. Studies involving layered magnetic materials based on triangle lattices, in particular, have resulted in many observations of unusual low temperature spin dynamics, and have presented new challenges for the theoretical understanding of magnetic systems. The magnetic properties of some compounds exhibiting these triangle-based lattices are described here in detail.Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Synthesis, structure and magnetic properties of low dimensional spin systems in the 3d transition metal oxides and superconductivity in magnesium borate.
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100 1 $a Rogado, Nyrissa S. $3 1944993
245 1 0 $a Synthesis, structure and magnetic properties of low dimensional spin systems in the 3d transition metal oxides and superconductivity in magnesium borate.
300 $a 142 p.
500 $a Source: Dissertation Abstracts International, Volume: 64-05, Section: B, page: 2186.
500 $a Adviser: Robert J. Cava.
502 $a Thesis (Ph.D.)--Princeton University, 2003.
520 $a The major part of this thesis deals with the synthesis and magnetic characterization of low dimensional spin systems in the 3d transition metal oxides. Such systems are of interest due to the simplicity of their structures, allowing theoretical modeling of their electronic and magnetic behavior. Exotic properties are also often encountered. Studies involving layered magnetic materials based on triangle lattices, in particular, have resulted in many observations of unusual low temperature spin dynamics, and have presented new challenges for the theoretical understanding of magnetic systems. The magnetic properties of some compounds exhibiting these triangle-based lattices are described here in detail.
520 $a BaNi2V2O8 is a spin-1 antiferromagnet on a honeycomb net. Susceptibility χ(T), specific heat C(T), and neutron diffraction measurements on this compound reveal the onset of antiferromagnetic (AFM) long-range ordering (LRO) close to 50 K. Diffuse diffraction peaks that are characteristic of two-dimensional (2D) short-range order are also observed up to 100 K. χ(T) of Ba(Ni1−xMgx)2V 2O8 shows the gradual disappearance of LRO with doping.
520 $a Ni3V2O8, Co3V2O 8, and β-Cu3V2O8 have spin-1, spin-3/2, and spin-1/2 magnetic lattices that are a new anisotropic variant of the Kagomé net, wherein edge-sharing MO6 octahedra form the rises and rungs of a “Kagomé staircase”. The anisotropy largely relieves the geometric frustration, but results in rich magnetic behavior. Characterization of the magnetization of polycrystalline samples of Ni 3V2O8 and Co3V2O8 reveals that the compounds are ferrimagnetic in character. C(T) show four distinct magnetic phase transitions below 9 K for Ni3V2O 8 and two below 11 K for Co3V2O8. In the case of β-Cu3V2O8, χ(T) and C(T) show the onset of short-range ordering at approximately 75 K, and a magnetic phase transition with the characteristics of antiferromagnetism at around 29 K.
520 $a The second part of this thesis describes the bulk synthesis of M9132 at temperatures as low as 500 to 550°C with good superconducting properties. Most reported bulk synthesis of MgB2 has been done at high temperatures (e.g. 900°C), which is not favorable for thin film synthesis. The results of this work confirm the potential of developing an “in-situ” thin film technology based on MgB2.
590 $a School code: 0181.
650 4 $a Chemistry, Inorganic. $3 517253
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0488
690 $a 0611
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710 2 0 $a Princeton University. $3 645579
773 0 $t Dissertation Abstracts International $g 64-05B.
790 1 0 $a Cava, Robert J., $e advisor
790 $a 0181
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3089880