Growth and some properties of large praseodymium pentaphosphate single crystals

Abstract

Measurements of H/L values for two or more values of [A]0 and/or [D]°a llows simultaneous solution for the "best" values of K and ¿srxH°. Because of the finite concentrations of both components, the concentration of the complex is given by a quadratic equation:The squared term prevents simple solution of these equations by linear regression and is often approximated as zero. Combination of these equations givesor each data point. The approximate solution takes [C] = 0 in calculating values of Y. A reiterative program then performs a weighted linear regression minimizing the deviations in values of H/L. Approximate values are calculated from Km/b and £stxH°= \/m. This approximate value of K is used with the formal concentrations of donor and acceptor in the quadratic equation to calculate values for [C] and improved values of Y, leading to an improved value of K. This process is continued until successive values of K agree to within 0.01%, and this value of K and its statistical standard deviation are taken as "best" values, along with the corresponding values of 7°a nd its standard deviation. These calculations were performed on an Apple He microcomputer.

Preparation and Characterization of Calcium Carbonate Masterbatch–Alkali Soluble Polyester/Polyester Porous Fiber via Melt Spinning

“…An Elmer STA8000 synchronous thermal analyzer (PerkinElmer Co., Ltd., Waltham, MA, USA) was utilized to perform thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) tests according to the standards the reference [ 19 ] GB/T 27661-2011 and [ 20 ] GB/T 19466.2-2004. TGA involved a 6 mg sample mass, with a temperature rise rate of 20 °C/min under a nitrogen atmosphere (nitrogen rate of 50 mL/min) up to 800 °C.…”