Invar effect in n-Nb{sub 2}O{sub 5}, {alpha}{sub ht}-Nb{sub 2}O{sub 5}, and L-Nb{sub 2}O{sub 5}

Journal Article · Fri May 15 04:00:00 EDT 2009 · Crystallography Reports

DOI:https://doi.org/10.1134/S1063774509030183· OSTI ID:22050830

Akhnazarova, V V; Shilkina, L A; Razumovskaya, O N; Dudkina, S I ^[1]

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1. Southern Federal University, Research Institute of Physics (Russian Federation)

An X-ray diffraction analysis of two commercial sets of niobium pentaoxide (Nb{sub 2}O{sub 5}) of Nbo-Pt grade has been performed. Each set reveals the coexistence of three modifications: n-Nb{sub 2}O{sub 5}, {alpha}{sub ht}-Nb{sub 2}O{sub 5}, and L-Nb{sub 2}O{sub 5}. Anomalous behavior in the structural characteristics, with the occurrence of plateaus upon heating (the invar effect), is established for each phase. It is suggested that the coincidence of the temperature ranges with constant unit-cell parameters in Nb{sub 2}O{sub 5} and complex Nb-containing oxides indicates the unified nature of the invar effect, which is related to the defect state of objects under study.

• OSTI ID: 22050830
• Journal Information: Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 3 Vol. 54; ISSN 1063-7745; ISSN CYSTE3
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL DEFECTS
HEATING
INVAR
MODIFICATIONS
NIOBIUM OXIDES
X-RAY DIFFRACTION