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Synthesis, magnetic and transport pr...

Gonen, Zehra Serpil.

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Synthesis, magnetic and transport properties of transition metal sulfides and oxides.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Synthesis, magnetic and transport properties of transition metal sulfides and oxides./
作者:	Gonen, Zehra Serpil.
面頁冊數:	215 p.
附註:	Source: Dissertation Abstracts International, Volume: 63-06, Section: B, page: 2836.
Contained By:	Dissertation Abstracts International63-06B.
標題:	Chemistry, Inorganic. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoeng/servlet/advanced?query=3055569
ISBN:	0493711570

Synthesis, magnetic and transport properties of transition metal sulfides and oxides.
Gonen, Zehra Serpil.

Synthesis, magnetic and transport properties of transition metal sulfides and oxides. - 215 p.

Source: Dissertation Abstracts International, Volume: 63-06, Section: B, page: 2836.

Thesis (Ph.D.)--University of Maryland College Park, 2002.

The low temperature physical properties of known ternary sulfide phases, BaFe2S3 and Ba6Fe8S15, have been studied. They show spin-glass like behavior at low temperatures and are semiconductors. BaFe2S3 is a rare example of a magnetoresistive sulfide that is one dimensional. Sr substitution into BaMnS 2 structure produces Ba0.93Sr0.07MnS2. Sr changes the coordination environment of Ba<super>2+</super>/Sr<super>2+ </super> and induces short range magnetic ordering. New perovskites and perovskite related oxides were prepared with Mn/Ru, Ni/V and Cu/V at the B site and La, Ba, Ca at the A site of ABO3 lattice. The compounds show a wide range of magnetic and transport properties. Ba3MnRu2O 9 adopts a hexagonal 9R structure. It displays spin-glass like behavior at low temperatures and shows temperature dependent spin at high temperatures due to metal-metal bonding. The Ca3MnRu2O 9 and LaMnxRu1−xO3 (0 < x < 1) series adopt GdFeO3 type perovskite structure. Ca 3MnRu2O9 is a ferrimagnetic semiconductor with very low room temperature resistivity. The LaMnxRu1−x O3 series shows spin-glass like behavior with varying dominant interactions from antiferromagnetism (x ≤ 0.25) to ferrimagnetism (x > 0.25). There is an insulator to metal transition at x = 0.05. La3Ni 2VO9 also has a GdFeO3 structure and is a semiconductor. The magnetic susceptibility of this compound displays a spin-glass like behavior with suppressed effective magnetic moment. “LaCu2VO 9” possess a superstructure and the composition is best described as La13V4Cu9O38.5. It has a hexagonal structure with Cu3 cluster units and V and Cu are trigonal bipyramidally coordinated. This compound is a semiconductor and the magnetic susceptibility follows the Curie-Weiss law with S = 1/2 per Cu<super>2+</super> (T > 220K) to S = 1/2 per Cu3 units (T < 50K). La14V6CuO 36.5 is a decomposition product of La13V4Cu 9O38.5. It is a transparent copper oxide which contains [OCuO]<super> 3−</super> sticks. Soft chemical synthesis methods have been utilized to prepare new metastable compounds. The ion exchange reactions of AMCuS 2 (A = Rb, Cs; M = Mn, Fe) with various salts are complicated by the stability of the decomposition products. Concerted cation anion extraction from K2La2Ti3O10 with PPh 4Br results in preparation of two metastable compounds, KLa2Ti 3O9.5 and La2Ti3O9. In the oxide system, Cs0.5LaNb2O6.5X0.5 (X = Cl, Br), Cs0.5Mg0.25LaNb2O7, and Cs0.5Mg0.5La5/6Nb2O7 can be prepared via ion exchange of CsLaNb2O7 with PPh4X, MgCl2 and MgCl2.6H2O.

ISBN: 0493711570Subjects--Topical Terms:

517253
Chemistry, Inorganic.

Synthesis, magnetic and transport properties of transition metal sulfides and oxides.
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500 $a Source: Dissertation Abstracts International, Volume: 63-06, Section: B, page: 2836.
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502 $a Thesis (Ph.D.)--University of Maryland College Park, 2002.
520 $a The low temperature physical properties of known ternary sulfide phases, BaFe2S3 and Ba6Fe8S15, have been studied. They show spin-glass like behavior at low temperatures and are semiconductors. BaFe2S3 is a rare example of a magnetoresistive sulfide that is one dimensional. Sr substitution into BaMnS 2 structure produces Ba0.93Sr0.07MnS2. Sr changes the coordination environment of Ba<super>2+</super>/Sr<super>2+ </super> and induces short range magnetic ordering. New perovskites and perovskite related oxides were prepared with Mn/Ru, Ni/V and Cu/V at the B site and La, Ba, Ca at the A site of ABO3 lattice. The compounds show a wide range of magnetic and transport properties. Ba3MnRu2O 9 adopts a hexagonal 9R structure. It displays spin-glass like behavior at low temperatures and shows temperature dependent spin at high temperatures due to metal-metal bonding. The Ca3MnRu2O 9 and LaMnxRu1−xO3 (0 < x < 1) series adopt GdFeO3 type perovskite structure. Ca 3MnRu2O9 is a ferrimagnetic semiconductor with very low room temperature resistivity. The LaMnxRu1−x O3 series shows spin-glass like behavior with varying dominant interactions from antiferromagnetism (x ≤ 0.25) to ferrimagnetism (x > 0.25). There is an insulator to metal transition at x = 0.05. La3Ni 2VO9 also has a GdFeO3 structure and is a semiconductor. The magnetic susceptibility of this compound displays a spin-glass like behavior with suppressed effective magnetic moment. “LaCu2VO 9” possess a superstructure and the composition is best described as La13V4Cu9O38.5. It has a hexagonal structure with Cu3 cluster units and V and Cu are trigonal bipyramidally coordinated. This compound is a semiconductor and the magnetic susceptibility follows the Curie-Weiss law with S = 1/2 per Cu<super>2+</super> (T > 220K) to S = 1/2 per Cu3 units (T < 50K). La14V6CuO 36.5 is a decomposition product of La13V4Cu 9O38.5. It is a transparent copper oxide which contains [OCuO]<super> 3−</super> sticks. Soft chemical synthesis methods have been utilized to prepare new metastable compounds. The ion exchange reactions of AMCuS 2 (A = Rb, Cs; M = Mn, Fe) with various salts are complicated by the stability of the decomposition products. Concerted cation anion extraction from K2La2Ti3O10 with PPh 4Br results in preparation of two metastable compounds, KLa2Ti 3O9.5 and La2Ti3O9. In the oxide system, Cs0.5LaNb2O6.5X0.5 (X = Cl, Br), Cs0.5Mg0.25LaNb2O7, and Cs0.5Mg0.5La5/6Nb2O7 can be prepared via ion exchange of CsLaNb2O7 with PPh4X, MgCl2 and MgCl2.6H2O.
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