The Raman spectrum of a KNO3 single crystal was measured at both room and liquid-nitrogen temperatures. Lattice-dynamical calculations, based on the rigid-ion approximation and empirical potentials, were performed. The possibility of a phase transition at 217 K was investigated by measuring the temperature dependence of the Raman spectrum. ©1992 The American Physical Society. Used by permission...

We report a first-principles simulation study of phase transitions in KNO3, using our recently developed method for treating ionic molecular solids. With the interionic potentials calculated from ab initio electron charge densities of the ions, our structural static relaxation gave close fits to both the normal room-temperature (α-phase) and the ferroelectric (γ-phase) structures. Our supercell...

The present study was conducted during the two successive seasons, 2017 and 2018, at King Saud University, Saudi Arabia, to investigate effects of foliar sprays on Ziziphus jujuba trees by yeast extract 1% 2% potassium nitrate (KNO3) 2%. All treatments were applied twice (December 15–January 15) in both seasons. Yield fruit quality studied. Treatments significantly improved yield, physical chem...

An experiment was conducted from September 2019 to March 2020 examine the effect of different combination foliar applicable fertilizers on Hybrid tea rose cultivar Mohana. The study performed with 9 treatments (T1-RDF, T2- KNO3 2.5g/l, T3- 5.0g/l, T4- Soluble fertilizer (Sujala) 1g/l, T5- 2 g/l, T6- 1g/L+ T7- 1 g/l + 1.5g/l, T8- 1g/L 2g/l, T9- 1g/l+ 2.5g/l) and 3 replications. From this T8 (KNO...

Molten salt LiNO3-NaNO3-KNO3 has been investigated as heat transfer and thermal storage media for its low melting point good performance. In this paper, nanofluids were synthesized by dispersing MgO nanoparticles into LiNO3-NaNO3-KNO3, the effects of on properties studied with different sizes (20–100 nm) mass percent concentrations (0.5–2.0 wt.%). The addition had little effect temperature, led...

This study aims to investigate ion composition of PM2.5 in various sites and seasons identify the main sources on spatial temporal basis. compositions two urban rural areas Northern Thailand 2019 were investigated distinguish traffic open burning sources. During season, average concentrations (104 ± 45 ?g m?3) slightly higher than those (94 39 m?3). Source identification by cluster analysis dur...