High pressure synthesis and structural evolution of new compounds of formulation NaNb /SUB 1-x/ W /SUB x/ O/sub 3/

Journal Article · Thu Dec 01 00:00:00 EST 1983 · Mater. Res. Bull.; (United States)

DOI:https://doi.org/10.1016/0025-5408(83)90185-X· OSTI ID:6212351

Miyamoto, Y; Doumerc, J P; Hagenmuller, P; Kume, S

Solid solutions of formula NaNb /SUB 1-x/ W /SUB x/ O/sub 3/ (0 less than or equal to x less than or equal to 1) have have been prepared using a high pressure technique and their structural evolution observed as Nb/sup 5 +/ is substituted by W/sup 5 +/. Five phases with perovskite-related structures have been identified: two orthorhombic phases with space group Pbma (0 less than or equal to x less than or equal to 0.16 and 0.20 less than or equal to x less than or equal to 0.40), another orthorhombic phase whose b axis is approximately one quarter of the former (0.40 < x < 0.52) and two cubic phases (x approx. = 0.16 and 0.52 less than or equal to x less than or equal to 1). An attempt is made to correlate the complex evolution with x of the lattice parameters in the orthorhombic phases with the change of octahedron size and tilting angles.

• Research Organization: College of General Education, Osaka University
• OSTI ID: 6212351
• Journal Information: Mater. Res. Bull.; (United States), Vol. 18:12
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
NIOBIUM COMPOUNDS
CHEMICAL PREPARATION
CRYSTAL-PHASE TRANSFORMATIONS
SODIUM COMPOUNDS
SOLID SOLUTIONS
TUNGSTATES
CUBIC LATTICES
ORTHORHOMBIC LATTICES
PHYSICAL METALLURGY
STRUCTURE FACTORS
ALKALI METAL COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DISPERSIONS
METALLURGY
MIXTURES
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SOLUTIONS
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical &amp; Physicochemical Properties