Point
defects and mechanisms for the formation of thermoelectrical
solid solutions PbTe-³2Te3
Chem.
Met. Alloys 5 (2012) 77-83
https://doi.org/10.30970/cma5.0199
Dmytro FREIK, Liliya TUROVSKA, Volodymyra BOYCHUK
An analysis of the concentration and
temperature dependencies of thermoelectrical
parameters of the solid solutions n-PbTe-³2Te3 and p-PbTe-³2Te3 is presented. Two mechanisms for
the formation of solid solutions based on PbTe have been considered within the
framework of the crystal-quasi-chemical formalism: the substitution of bismuth
ions at lead positions BiPb+
with appearance of cation vacancies VPb2-
(²) or neutral interstitial
tellurium atoms Tei0 (²²). The dependencies of
the Hall concentration and the
concentration of point defects on the composition of the solid solution and the
initial deviation from stoichiometry in the matrix
were calculated.
Çàëåæí³ñòü õîëë³âñüêî¿ êîíöåíòðàö³¿ íîñ³¿â ñòðóìó òà êîíöåíòðàö³¿ äîì³íóþ÷èõ òî÷êîâèõ äåôåêò³â êðèñòàë³â ð-PbTe-³2Te3 â³ä âì³ñòó ³2Òå3.
Keywords
Lead telluride / Solid solution / Point defects / Crystal-quasi-chemical formulae / Mechanism for the formation of defects