Microstructure and metal-insulator transition in single crystalline KMo4O6

Author(s)

Margareth Andrade ^[1] ; Mariana Lanzoni Maffei ^[2] ; Leandro Marcos Salgado Alves ^[3] ; Carlos Alberto Moreira dos Santos ^[4] ; Bento Ferreira ^[5] ; Antonio Fernando Sartori ^[6]

Affiliation

^[1] Universidade de São Paulo. Escola de Engenharia de Lorena. Departamento de Engenharia de Materiais - Brasil

^[2] Universidade de São Paulo. Escola de Engenharia de Lorena. Departamento de Engenharia de Materiais - Brasil

^[3] Universidade de São Paulo. Escola de Engenharia de Lorena. Departamento de Engenharia de Materiais - Brasil

^[4] Universidade de São Paulo. Escola de Engenharia de Lorena. Departamento de Engenharia de Materiais - Brasil

^[5] Universidade de São Paulo. Escola de Engenharia de Lorena. Departamento de Engenharia de Materiais - Brasil

^[6] Universidade de São Paulo. Escola de Engenharia de Lorena. Departamento de Engenharia de Materiais - Brasil

• Document type: Journal article
• Source: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 15, n. 6, p. 998-1002, 2012-10-11.

Abstract

High quality KMo4O6 single crystals with tetragonal structure (space group P4/mbm) have been prepared by fused salt electrolysis. The crystals were studied by scanning electron microscopy (SEM), X-ray diffractometry, electrical resistivity, and magnetization measurements. X-ray powder diffraction patterns and SEM have given some information on the growth of single crystals. Electrical resistivity as a function of temperature shows that the KMo4O6 compound is a bad metal with resistivity change of approximately 30% in the temperature range from 2 to 300K. A metal-insulator transition (MIT), observed at approximately 110K, has been also confirmed for this material. Magnetization as a function of temperature agrees with previous report, however a magnetic ordering has been observed in M(H) curves in the whole temperature range. (AU)

• FAPESP's process: 09/54001-2 - Acquisition of cryogen-free equipment for the characterization of magnetic properties by vibrating sample magnetometry
• Grantee: Carlos Alberto Moreira dos Santos
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 10/06637-2 - Crystalline structure and physical properties of the anomalous conductor KxMoO2-d
• Grantee: Leandro Marcos Salgado Alves
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 09/14524-6 - Re-liquefier for using in a 9 t MagLab Oxford
• Grantee: Carlos Alberto Moreira dos Santos
• Support Opportunities: Regular Research Grants