Synthesis and Crystal Chemistry of New Transition Metal Tellurium Oxides in Compounds Containing Lead and Barium

2000 ◽  
Vol 658 ◽  
Author(s):  
Boris Wedel ◽  
Katsumasa Sugiyama ◽  
Kimio Itagaki ◽  
Hanskarl Müller-Buschbaum
Keyword(s):  
Solid State ◽  
Transition Metal ◽  
Solid State Reactions ◽  
Solid State Chemistry ◽  
Wide Field ◽  
Synthesis Conditions ◽  
Lead Compounds ◽  
Alkaline Transition ◽  
New Compounds ◽  
Channel Structures

ABSTRACTDuring the past decades the solid state chemistry of tellurium oxides has been enriched by a series of quaternary metallates. Interest attaches not only to the chemical and physical properties of these compounds, but also to their structure, which have been studied by modern methods. The partial similarity of earth alkaline metals and lead in solid state chemistry and their relationships in oxides opens a wide field of investigations. Eight new compounds in the systems Ba-M-Te-O (M= Nb, Ta) and Pb-M-Te-O (M = Mn, Ni, Cu, Zn) were prepared and structurally characterized: Ba2Nb2TeO10, Ba2M6Te2O21 (M = Nb, Ta) and the lead compounds PbMnTeO3, Pb3Ni4.5Te2.5O15, PbCu3TeO7, PbZn4SiTeO10 and the mixed compound PbMn2Ni6Te3O18. The structures of all compounds are based on frameworks of edge and corner sharing oxygen octahedra of the transition metal and the tellurium. Various different channel structures were observed and distinguished. The compounds were prepared by heating from mixtures of the oxides, and the single crystals were grown by flux method or solid state reactions on air. The synthesis conditions were modified to obtained microcrystalline material for purification and structural characterizations, which were carried out using a variety of tools including powder diffraction data and refinements of X-ray data. Relationships between lead transition metal tellurium oxides and the earth alkaline transition metals tellurium oxides are compared.

Über eine neue Präparationstechnik in der Feststoffchemie, I Hochtemperatursynthesen mit CO2-Laser / A New Preparation Technique in Solid State Chemistry, I High Temperature Reactions with CO2-Laser

1979 ◽  
Vol 34 (3) ◽  
pp. 371-374 ◽  
Author(s):  
Hk. Müller-Buschbaum ◽  
H. Pausch
Keyword(s):  
High Temperature ◽  
Laser Radiation ◽  
Solid State ◽  
Co2 Laser ◽  
Solid State Reactions ◽  
Solid State Chemistry ◽  
Preparation Technique ◽  
Temperature Method ◽  
High Temperature Reactions

Abstract A new high temperature method using a CO2-Laser radiation is reported. Its application on solid state reactions in air or in defined gas atmospheres is described.

Frederick Clifford Tompkins. 29 August 1910 – 5 November 1995

2004 ◽  
Vol 50 ◽  
pp. 309-313
Author(s):  
David King ◽  
John Enderby
Keyword(s):  
Solid State ◽  
Surface Science ◽  
Metal Films ◽  
Solid Surfaces ◽  
Theoretical Physics ◽  
Solid State Reactions ◽  
Solid State Chemistry ◽  
Grammar School ◽  
Lennard Jones ◽  
Research Fields

Frederick Tompkins was a physical chemist of great distinction whose contributions to the development of two research fields, surface science and solid state reactions, were matched by his long service as Secretary and Editor of the Faraday Society. Throughout his career he had the knack of attracting bright young students into his research group and, through a rigorous apprenticeship, turning them out as scientists who went on to occupy senior academic positions around the world. Thus his influence extended well beyond his own immediate contributions. Tompkins's early studies of adsorption (the taking–up of gases by surfaces) on solid surfaces were on polar solids but, although this was always maintained as an interest, perhaps his best–known contributions to adsorption studies were on metal surfaces. Work initiated in the 1950s, based on metal films deposited under stringent conditions and covering a range of different physical techniques, established his reputation firmly in the field of chemisorption on metals. Students and postdoctoral workers of his continued the development of this field. Tompkins was born in Yeovil, Somerset, in 1910, and was pleased to record that his scientific attainment at Yeovil Grammar School, which won him a County Scholarship to Bristol University, was matched by his talent as an essayist and as a pianist. As an undergraduate he was greatly influenced by the teaching of William Garner (FRS 1937) and of John (later Sir John) Lennard–Jones (FRS 1933), and at the age of 20 years he graduated with first–class honours in chemistry and theoretical physics. He completed his PhD at Bristol with Garner, who first introduced him to both surface and solid state chemistry.

Neue Verbindungen Ag2HgMX4 mit Wurtzstannitstruktur / New Compounds Ag2HgMX4 with the Wurtzstannite Type Structure

1989 ◽  
Vol 44 (9) ◽  
pp. 1035-1036 ◽  
Author(s):  
H. Haeuseler ◽  
M. Himmrich
Keyword(s):  
Solid State ◽  
Type Structure ◽  
Solid State Reactions ◽  
Similar Composition ◽  
X Ray ◽  
Unknown Structure ◽  
New Compounds

Three new compounds, Ag2HgGeS4, Ag2HgSnS4, and Ag2HgSnSe4, crystallizing in the wurtzstannite type structure have been prepared by solid state reactions at 700°C and characterized by X-ray powder methods. A fourth compound of similar composition Ag2HgGeSe4, with an hitherto unknown structure crystallizes cubically with a = 10.796 A.

Über eine neue Präparationstechnik in der Feststoffchemie, II Hochdruck-Hochtemperatursynthesen mit CO2 -Laser / A New Preparative Technique in Solid State Chemistry, II High Pressure -High Temperature Reactions with CO2-Lasers

1979 ◽  
Vol 34 (3) ◽  
pp. 375-377 ◽  
Author(s):  
Hk. Müller-Buschbaum ◽  
H. Pausch
Keyword(s):  
High Pressure ◽  
Solid State ◽  
Solid State Reactions ◽  
Solid State Chemistry ◽  
Co2 Lasers ◽  
High Pressure High Temperature ◽  
High Oxygen Pressure ◽  
High Temperature Reactions ◽  
A New Technique ◽  
Set Up

Abstract A new technique to realize solid state reactions under high oxygen pressure is reported. This method is based on the use of CO2-Laser radiation in combination with autoclave technique. The experimental set-up is described.

Pb6Ba2(BO3)5X (X = Cl, Br): new borate halides with strong predicted optical anisotropies derived from Pb2+and (BO3)3−

2015 ◽  
Vol 44 (15) ◽  
pp. 7041-7047 ◽  
Author(s):  
Lu Liu ◽  
Bingbing Zhang ◽  
Fangfang Zhang ◽  
Shilie Pan ◽  
Fangyuan Zhang ◽  
...  
Keyword(s):  
Solid State ◽  
First Principles ◽  
Solid State Reactions ◽  
First Principles Calculations ◽  
New Compounds ◽  
532 Nm

Two new compounds, Pb6Ba2(BO3)5X (X = Cl, Br), were successfully synthesized by solid-state reactions. First-principles calculations show that they have large birefringence of 0.1582 and 0.1810 at 532 nm.

HREM in solid-state chemistry and crystallography

1992 ◽  
Vol 50 (1) ◽  
pp. 104-105
Author(s):  
Lars Kihlborg ◽  
Margareta Sundberg ◽  
Gunnar Svensson
Keyword(s):  
Solid State ◽  
High Temperature Superconductors ◽  
High Resolution Electron Microscopy ◽  
Atomic Resolution ◽  
Solid State Chemistry ◽  
X Ray ◽  
Solid State Ionics ◽  
Resolution Electron ◽  
New Compounds

High-resolution electron microscopy has had a great impact on solid state chemistry. The possibility it offers of directly imaging the structure of solids has made it an unvaluable complement to conventional diffraction methods. Disorder and extended effects have become accessible to observation, superstructures, structural modulations and microphases can be identified and particles down to nanometer size can be studied. Combined with electron diffraction and x-ray microanalysis it is a powerful tool for phase analysis, giving guidance to synthesis of new compounds. Under certain conditions even chemical reactions can be studied in situ at atomic resolution. Numerous examples in be found in the fields of high-temperature superconductors, zeolites, ferroelectrics and solid state ionics.

Sign in / Sign up

Export Citation Format

Share Document