Phase transitions and changes in the electrophysical properties of WO3 in the temperature range of 83-673 K
The paper presents data on changes in the crystal structure and dielectric characteristics of WO3 in the temperature range from 83 to 673 K. The results of X-ray phase analysis, scanning electron microscopy of the studied materials are presented. It has been established that cooling the WO3 powder to a temperature of 83 K causes a change in the crystalline phase from triclinic to monoclinic. Further roasting to a temperature of 673 K again changes the crystal structure to the triclinic phase. The maximum reflex for the original WO3 and burned to a temperature of 673 K is observed at 2θ = 24.34°, and for WO3 subjected to a low-temperature exposure, the maximum reflex at 2θ = 23.08°. The burning of WO3 powder leads to a change in the parameter of the unit cell for the maximum reflection 2θ = 24.34°: a = 6.333 Å (for the original WO3), a = 6.339 Å (for WO3 fired). The main electrophysical characteristics of the studied WO3 powders were measured and calculated: surface resistance, specific surface resistance and conductivity, electrical conductivity, dielectric constant, dielectric loss tangent.
Keywords
оксид вольфрама, кристаллическая структура, температурное воздействие, микроискажения кристаллической решетки, плотность дислокаций, диэлектрические характеристики, tungsten oxide, crystal structure, temperature effect, crystal microdistortion, dislocation density, dielectric characteristicsAuthors
Name | Organization | |
Cherkashina N.I. | Belgorod State Technological University named after V.G. Shukhov | natalipv13@mail.ru |
Pavlenko V.I. | Belgorod State Technological University named after V.G. Shukhov | natalipv13@mail.ru |
Yastrebinskii R.N. | Belgorod State Technological University named after V.G. Shukhov | yrndo@mail.ru |
References
Phase transitions and changes in the electrophysical properties of WO3 in the temperature range of 83-673 K | Izvestiya vuzov. Fizika. 2019. № 5. DOI: 10.17223/00213411/62/5/126