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- W2801160183 abstract "The object of the thesis is to demonstrate the existence of Schottkytype anomalies in the low temperature thermal expansion of dielectriccrystals produced by the presence of a small concentration of stronglycoupled paramagnetic impurity ions.Cryogenic equipment, utilising a three terminal capacitance dilatometer,for the semi-automatic measurement of thermal expansion at low temperaturesusing a dynamic measurement technique has been designed, constructedand commissioned. The results of application of this apparatus todetermine the contribution to the thermal expansion at low temperaturesof aluminium oxide (Al2O3) due to small concentrations of stronglycoupled paramagnetic ions (Cr2+(3d4, 5D), Mn3+(3d4, 5D), v3+ (3d2 , 3F))is presented. Peaked anomalies in the thermal expansion of Al2O3 dopedwith these ions have been observed which are not present for undopedsamples. The effects observed are in contrast with those predictedusing a static crystal field model but may be interpreted in terms of adynamic Jahn-Teller model." @default.
- W2801160183 created "2018-05-17" @default.
- W2801160183 creator A5053246529 @default.
- W2801160183 date "1982-01-01" @default.
- W2801160183 modified "2023-09-23" @default.
- W2801160183 title "The use of low-temperature thermal expansion for the detection of paramagnetic ions in dielectrics" @default.
- W2801160183 hasPublicationYear "1982" @default.
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