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Thermal vacuum evaporation peculiarities of perovskite-type barium-strontium hafnate
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Abstract
Experimental results are presented on the thermal vacuum evaporation of barium hafnate BaHfO3 and double barium-strontium hafnate Ba0.5Sr0.5HfO3, which are included together with finely dispersed tungsten as components in sintered composites. It is found that at T = 1900 K only barium and barium oxide are the products of BaHfO3 evaporation, i.e., congruent evaporation of BaHfO3 does not occur. Investigations of Ba0.5Sr0.5HfO3 evaporation at T = 1600 K showed that it also does not evaporate congruently. At the same time, the nucleation of a new phase of BaO·SrO in the form of structures with D6 symmetry was detected. Using a high-current vacuum arc discharge, congruent evaporation of Ba0.5Sr0.5HfO3 takes place, forming various crystalline formations of double barium-strontium hafnate on the substrate.
Title: Thermal vacuum evaporation peculiarities of perovskite-type barium-strontium hafnate
Description:
Abstract
Experimental results are presented on the thermal vacuum evaporation of barium hafnate BaHfO3 and double barium-strontium hafnate Ba0.
5Sr0.
5HfO3, which are included together with finely dispersed tungsten as components in sintered composites.
It is found that at T = 1900 K only barium and barium oxide are the products of BaHfO3 evaporation, i.
e.
, congruent evaporation of BaHfO3 does not occur.
Investigations of Ba0.
5Sr0.
5HfO3 evaporation at T = 1600 K showed that it also does not evaporate congruently.
At the same time, the nucleation of a new phase of BaO·SrO in the form of structures with D6 symmetry was detected.
Using a high-current vacuum arc discharge, congruent evaporation of Ba0.
5Sr0.
5HfO3 takes place, forming various crystalline formations of double barium-strontium hafnate on the substrate.
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