Published August 2000 | Version v1
Journal article Metadata-only

Hydrothermal synthesis and properties of sodium pentatungstate monohydrate Na2W5O16 · H2O

Creators

  • 1. Inst. Ehksperimental'noj Mineralogii RAN, Chernogolovka (Russian Federation)
  • 2. Inst. Strukturnoj Makrokinetiki RAN, Chernogolovka (Russian Federation)
  • 3. Inst. Stali i Splavov, Ehlektrostal' (Russian Federation)

Description

Compound Na2W5O16 · H2O in the form of colorless mica-like crystals of density 7.007 ± 0.005 g/cm3, which looses water in the range of 260-660 deg C and melts incongruently at 770 ± 5 deg C, has been prepared for the first time during hydrothermal synthesis from WO3 in 5-15 wt.% NaCl solution at 500 deg C and pressure of 40-50 MPa. It is ascertained that Na2W5O16 · H2O has a triclinic cell with the following parameters: a = 17.91 (1), b = 26.92 (1), c = 39.93 (1) A, λ = 99.5 (1) deg, β = 91.9 (1) deg, γ = 98.6 (1) deg, Z = 64. Phase diagram of sodium polytungstates stability in the right part of Na2O-WO3 system is refined

Abstract (Russian)

При гидротермальном синтезе WO3 в растворе 5-15 мас. % NaCl при 500 град. С и давлении 40-50 МПа впервые получено соединение Na2W5O16 · H2O в виде бесцветных слюдоподобных кристаллов плотностью 7,007 ± 0,005 г/см3, теряющее воду в интервале 260-660 град. С и инконгруэнтно плавящееся при 770 ± 5 град. С. Установлено, что Na2W5O16 · H2O имеет триклинную ячейку с параметрами: a = 17,91 (1), b = 26,92 (1), c 39,93 (1) A, λ = 99,5 (1) град., β = 91,9 (1) град., γ 98,6 (1) град., Z = 64. Уточнена фазовая диаграмма устойчивости поливольфраматов натрия в правой части системы Na2O-WO3

Additional details

Additional titles

Original title (Russian)
Гидротермальный синтез и свойства моногидрата пентавольфрамата натрия На

Publishing Information

Journal Title
Zhurnal Neorganicheskoj Khimii
Journal Volume
45
Journal Issue
8
Journal Page Range
p. 1297-1303
ISSN
0044-457X
CODEN
ZNOKAQ

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
32030249
Subject category
S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
Descriptors DEI
CHEMICAL COMPOSITION; CHEMICAL PREPARATION; CRYSTALS; DENSITY; HIGH PRESSURE; HYDRATES; LATTICE PARAMETERS; MELTING POINTS; PHASE DIAGRAMS; PYROLYSIS PRODUCTS; SODIUM TUNGSTATES; TEMPERATURE RANGE 0400-1000 K; THERMAL ANALYSIS; TRICLINIC LATTICES; X-RAY DIFFRACTION
Descriptors DEC
ALKALI METAL COMPOUNDS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIAGRAMS; DIFFRACTION; INFORMATION; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; REFRACTORY METAL COMPOUNDS; SCATTERING; SODIUM COMPOUNDS; SYNTHESIS; TEMPERATURE RANGE; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; TRANSITION TEMPERATURE; TUNGSTATES; TUNGSTEN COMPOUNDS

Optional Information

Notes
13 refs., 4 figs.