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

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.

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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 characteristics

Authors

NameOrganizationE-mail
Cherkashina N.I.Belgorod State Technological University named after V.G. Shukhovnatalipv13@mail.ru
Pavlenko V.I.Belgorod State Technological University named after V.G. Shukhovnatalipv13@mail.ru
Yastrebinskii R.N.Belgorod State Technological University named after V.G. Shukhovyrndo@mail.ru
Всего: 3

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 Phase transitions and changes in the electrophysical properties of WO<sub>3</sub> in the temperature range of 83-673 K | Izvestiya vuzov. Fizika. 2019. № 5. DOI: 10.17223/00213411/62/5/126

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

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