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On the chemical transport of some niobium oxides with TeCl 4 (II). The transport behaviour of the equilibrium NbO 2.417 to NbO 2.5
Author(s) -
Ritschel M.,
Oppermann H.,
Mattern N.
Publication year - 1978
Publication title -
kristall und technik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0023-4753
DOI - 10.1002/crat.19780131208
Subject(s) - natural bond orbital , niobium pentoxide , niobium , materials science , phase (matter) , thermodynamics , phase diagram , chemistry , inorganic chemistry , computational chemistry , density functional theory , metallurgy , organic chemistry , physics
A report is given on the transport behaviour of the equilibrium phases NbO 2.417 to NbO 2.483 and of niobium pentoxide during chemical transport with TeCl 4 . – It became apparent that phase‐pure NbO 2.417 and Nb 2 O 5 are deposited from the investigated equilibrium phases. Chemical transport of the phases NbO 2.453 to NbO 2.483 produces a mixture of several phases. This indicates a strong inhibition of the equilibration in the starting solid. Chemical transport of the niobium pentoxide caused the deposition of monocrystals of the upper and lower phase boundary. The experimental behaviour agrees very well with the calculated results. Monocrystals of the niobium pentoxide forms H, M, N, B and P are deposited in a well identifiable manner by variation of the temperatures ( T 2 , T 1 ).