Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
A NEW FURNACE DESIGN FOR USE IN COMBINED X-RAY-ABSORPTION AND DIFFRACTION OF CATALYSIS AND CERAMICS STUDIES - FORMATION FROM CARBONATE PRECURSORS OF CU, CO, MN SPINELS FOR THE OXIDATION OF CO AND THE FORMATIONOF PLZT, A PIEZOELECTRIC CERAMIC
Autore:
DENT AJ; GREAVES GN; ROBERTS MA; SANKAR G; WRIGHT PA; JONES RH; SHEEHY M; MADILL D; CATLOW CRA; THOMAS JM; RAYMENT T;
Indirizzi:
SERC,DARESBURY LAB WARRINGTON WA4 4AD CHESHIRE ENGLAND ROYAL INST GREAT BRITAIN LONDON W1X 4BS ENGLAND UNIV CAMBRIDGE,DEPT PHYS CHEM CAMBRIDGE CB2 1EP ENGLAND
Titolo Testata:
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms
fascicolo: 1-4, volume: 97, anno: 1995,
pagine: 20 - 22
SICI:
0168-583X(1995)97:1-4<20:ANFDFU>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
7
Recensione:
Indirizzi per estratti:
Citazione:
A.J. Dent et al., "A NEW FURNACE DESIGN FOR USE IN COMBINED X-RAY-ABSORPTION AND DIFFRACTION OF CATALYSIS AND CERAMICS STUDIES - FORMATION FROM CARBONATE PRECURSORS OF CU, CO, MN SPINELS FOR THE OXIDATION OF CO AND THE FORMATIONOF PLZT, A PIEZOELECTRIC CERAMIC", Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 97(1-4), 1995, pp. 20-22

Abstract

In order to measure combined X-ray absorption fine structure, XAFS and X-ray diffraction, XRD in-situ on a sample, which is being heated ina furnace, there are a number of constraints on the furnace design due to the geometry of the detectors around the sample. We present a newfurnace design which is based on a tube furnace: primarily for ceramics or catalysis research where the sample is heated in air, but at temperatures of up to 1200 degrees C. The design and specifications of this furnace are presented. To demonstrate the use of the high temperature furnace we have chosen a system which contains three elements, Mn, Co and Cu, whose XAFS and XRD have been measured. The sample was heated in air to 600 degrees C and the initial collapse of the crystalline carbonates was followed by the formation of the final spinel phase. Furthermore, the structural changes also accompany changes in the oxidation states, especially of Cu and Mn. The Cu and Mn in the final product is present as a mixture of Cu 1+ and 2+ and Mn as 3+ and 4+ oxidation states. The XAFS analysis of the data also yielded information aboutthe local coordination changes during the transformation of the precursor carbonates to the final spinel product. We also show some preliminary data from the kinetics of formation of PLZT [Pb0.92La0.08(Zr0.65Ti0.35)(0.98)O-3], from an amorphous gel to a crystalline phase material (ABO(3)).

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 11:47:21