Eine neue phase mit defekt-pyrochlor-struktur: TiYO2,1

Möhr, S.; Müller‐Buschbaum, Hk.

doi:10.1016/0925-8388(94)90124-4

“…The A 2 B 2 O 7 pyrochlore structure2 is important for properties as diverse as anion and mixed conduction,3 superconductivity,4 and colossal magnetoresistance,5 but, in contrast to ABO 3 perovskite, there is little chemistry established for the low‐temperature introduction of anion vacancies and generation of associated defect structures. Pyrochlore is well known for stabilizing high oxidation states on the octahedral B site; A II /B V and A III /B IV compositions are well established, and pyrochlores with mean B site oxidation states of less than +4 are rare (the Y II /Ti II pyrochlore‐related YTiO 2.1 prepared at 2800 °C is the sole example6). Here we report the systematic low‐temperature synthesis of pyrochlore systems with up to 90 % titanium( III ) on the octahedral sites.…”

Section: Refined Coordinates For Lu2ti2o643(1)[a]mentioning

confidence: 99%

New Oxidation States and Defect Chemistry in the Pyrochlore Structure

Blundred¹,

Bridges²,

Rosseinsky³

2004

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The introduction of anion vacancies into complex metal oxides is a powerful method of controlling structure and properties by tailoring metal coordination environment and oxidation state. The hydride anion can effect reductive transformations of oxides inaccessible to conventional metal getters or gaseous reducing agents.[1] The A 2 B 2 O 7 pyrochlore structure [2] is important for properties as diverse as anion and mixed conduction, [3] superconductivity, [4] and colossal magnetoresistance, [5] but, in contrast to ABO 3 perovskite, there is little chemistry established for the low-temperature introduction of anion vacancies and generation of associated defect structures. Pyrochlore is well known for stabilizing high oxidation states on the octahedral B site; A ). Here we report the systematic low-temperature synthesis of pyrochlore systems with up to 90 % titanium(iii) on the octahedral sites.

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“…[1] The A 2 B 2 O 7 pyrochlore structure [2] is important for properties as diverse as anion and mixed conduction, [3] superconductivity, [4] and colossal magnetoresistance, [5] but, in contrast to ABO 3 perovskite, there is little chemistry established for the low-temperature introduction of anion vacancies and generation of associated defect structures. Pyrochlore is well known for stabilizing high oxidation states on the octahedral B site; A pyrochlore-related YTiO 2.1 prepared at 2800 8C is the sole example [6] ). Here we report the systematic low-temperature synthesis of pyrochlore systems with up to 90 % titanium(iii) on the octahedral sites.…”

mentioning

confidence: 98%

New Oxidation States and Defect Chemistry in the Pyrochlore Structure

Blundred

¹

,

Bridges

²

,

Rosseinsky

³

2004

View full text Add to dashboard Cite

The introduction of anion vacancies into complex metal oxides is a powerful method of controlling structure and properties by tailoring metal coordination environment and oxidation state. The hydride anion can effect reductive transformations of oxides inaccessible to conventional metal getters or gaseous reducing agents.[1] The A 2 B 2 O 7 pyrochlore structure [2] is important for properties as diverse as anion and mixed conduction, [3] superconductivity, [4] and colossal magnetoresistance, [5] but, in contrast to ABO 3 perovskite, there is little chemistry established for the low-temperature introduction of anion vacancies and generation of associated defect structures. Pyrochlore is well known for stabilizing high oxidation states on the octahedral B site; A ). Here we report the systematic low-temperature synthesis of pyrochlore systems with up to 90 % titanium(iii) on the octahedral sites.

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“…Letztere Substanz ist durch eine große Phasen breite ausgezeichnet und wurde intensiv unter sucht [19][20][21][22][23][24]. Bei den ternären Oxiden gibt es lediglich Y T i0 2,i [25] mit Defekt-Pyrochlorstruktur und Ti0 ,33Ta0. 670 2 [26] für anorganische Chemie der U niversität Kiel durchgeführt.…”

Section: Introductionunclassified