Elastic,piezoelectric, and dielectric properties of lanthanum-gallium tantalate crystals at temperatures of 20–600°C

Measurements of the temperature variations in the relative dielectric constants e₃₃^T/e₀ \varepsilon_{33}^T/{\varepsilon_0} , e₁₁^T/e₀ \varepsilon_{11}^T/{\varepsilon_0} ,and e₂₂^T/e₀ \varepsilon_{22}^T/\varepsilon {}_0 , conductivities g₁₁, g₂₂, and g₃₃, elastic constants C₁₁^D C_{11}^D , C₆₆^D C_{66}^D , and S₂₂^E S_{22}^E , and electromechanical coupling constants k_t, k₂₆, and k₁₂ of lanthanum-gallium tantalate over temperatures of 20–600°C are reported. Data are presented on the effect of lifetime (breakdown) testing on these characteristics of the piezoelectric crystals after retention at a temperature of 625°C for 250 h.     

Zero-Current Deposition of Superconducting Nb3Sn Coatings from Molten Salts

Superconducting Nb–Sn coatings are produced by zero-current Sn deposition on Nb at 800–1070 K from KCl + NaCl and CsCl + KCl + NaCl eutectic melts containing SnCl₂. Their phase composition and superconducting properties are studied. This approach offers the possibility of producing single-phase Nb₃Sn coatings perfect enough to be used as working layers of superconducting microwave systems.