The 9.355 GHz Complex Permittivity of Light and Heavy Water from 1 to 90 "C Using an Improved High-Precision Instrumentation System
作者： Xiping Hu , Harvey A. Buckmaster , Oscar Barajas
DOI: 10.1021/JE00016A001
关键词: Instrumentation 、 Microwave 、 Chemistry 、 Permittivity 、 Heavy water 、 Electromagnetic radiation 、 Entropy of activation 、 Analytical chemistry 、 Gibbs free energy 、 Enthalpy 、 Thermodynamics
摘要: Recent improvements to a high-precision instrumentation system for measuring the complex permittivity of high loss liquids using variable-length transmission sample cell at microwave frequencies are described. An error analysis this is given. These have enabled heavy water and double-distilled, deionized light be measured with typical accuracy &0.1% 6' f0.2% 6'' precision about 0.02% 9.355 GHz in temperature interval from approximately 1 90 "C increments 2.5 "C. The values ~'(t) ~"(t) been fitted empirical quintic polynomials t ("0. For = 44.628(3) + (13.929(8) x 10-l)t - (3.222(6) 10-2)t2 (3.165(17) 10-4)t3 (1.503(21) (2.67(9) 10-9)t5 40.573(3) (1.475(6) (2.477(4) (6.092(12) (6.000(15) 10-6)t4 (2.213(7) 10-8)t5 31.452(17) (16.630(28) (2.796(17) (1.141(45) (0.920(54) (7.16(23) 37.610(9) (4.952(16) 10-1)t (4.749(10) 10-2)tZ (9.659(26) (8.609(30) (2.913(13) 10-8)t5. dependences Gibbs free energy, enthalpy, entropy activation parameters relaxation process as well time calculated both data sets water.
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