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S. M. Sergazina B. K. Kasenov E. S. Mustafin Sh. B. Kasenova Zh. I. Sagintaeva R. Sh. Erkasov 《Russian Journal of Applied Chemistry》2006,79(8):1225-1229
Ferrites with the composition GdMIIFe2O5.5 (MII = Mg, Ca, Sr) were synthesized from the corresponding oxides by the solid-phase method. The temperature dependence of the specific heat was studied by dynamic calorimetry in the temperature range 298.15 673 K. Equations describing this temperature dependence were derived. The temperature dependences of the thermodynamic functions were calculated. 相似文献
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B. K. Kasenov E. S. Mustafin M. A. Akubaeva S. T. Edil’baeva S. M. Sergazina R. Sh. Erkasov E. K. Zhumadilov 《Russian Journal of Inorganic Chemistry》2010,55(3):438-440
Double ferrites ErCaFe2O5.5, ErSrFe2O5.5, and ErBaFe2O5.5 were synthesized by solid-state reactions from erbium and iron(III) oxides and calcium, strontium, and barium carbonates.
The compounds were found to crystallize in the orthorhombic system. Their unit cell parameters were determined by X-ray powder
diffraction; their densities were measured. 相似文献
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S. M. Sergazina B. K. Kasenov E. S. Mustafin Zh. I. Sagintaeva S. Zh. Davrenbekov M. A. Akubaeva Sh. B. Kasenova R. Sh. Erkasov E. K. Zhumadilov 《Russian Journal of Inorganic Chemistry》2010,55(10):1607-1610
Ferrites of composition ErMIFe2O5 (MI = Li, Na, K, Cs) were synthesized by a solid-phase method. The structure of the ferrites was for the first time studied by X-ray powder diffraction. Crystal systems, unit cell parameters, and X-ray and pycnometric densities were determined. For ErLiFe2O5, a = 10.510 Å, c = 14.270 Å, V°= 1616.16 Å3, Z = 16, V subcell ° = 101.01 Å3, ρx = 6.01 g/cm3, ρpyc = 5.97 ± 0.04 g/cm3; for ErNaFe2O5, a = 10.519 Å, c = 15.510 Å, V° = 1759.56 Å3, Z = 16, V subcell ° = 109.90 Å3, ρx = 5.77 g/cm3, ρpyc = 5.72 ± 0.08 g/cm3; for ErKFe2O5, a = 11.050 Å, c = 15.480 Å, V° = 1937.33 Å3, Z = 16, V subcell ° = 121.08 Å3, ρx = 5.46 g/cm3, ρpyc = 5.41 ± 0.04 g/cm3; and for ErCsFe2O5, a = 10.78 Å, c = 16.01 Å, V° = 1905.37 Å3, Z = 16, V subcell ° = 119.09 Å3, ρx = 6.86 g/cm3, ρpyc = 6.61 ± 0.01 g/cm3. 相似文献
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Meruyert Sergazina Lua Vazquez Maria Llompart Thierry Dagnac 《Molecules (Basel, Switzerland)》2021,26(20)
Seventeen fungicides were determined in different matrices from vineyard areas, including vine leaves, soils, grapes and water, using gas chromatography coupled to tandem mass spectrometry (GC-MS/MS). For leaf analysis, ultrasound-assisted extraction (UAE) was performed evaluating different solvents. UAE was compared with other extraction techniques such as vortex extraction (VE) and matrix solid-phase dispersion (MSPD). The performance of the UAE method was demonstrated on vine leaf samples and on other types of samples such as tea leaves, underlining its general suitability for leaf crops. As regards other matrices, soils were analyzed by UAE and microwave-assisted extraction (MAE), grapes by UAE and waters by SPE using cork as the sorbent. The proposed method was applied to 17 grape leaf samples in which 14 of the target fungicides were detected at concentrations up to 1000 μg g−1. Furthermore, the diffusion and transport of fungicides was demonstrated not only in crops but also in environmental matrices. 相似文献
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B. K. Kasenov S. T. Edil’baeva E. S. Mustafin S. M. Sergazina Sh. B. Kasenova S. Zh. Davrenbekov 《Russian Journal of Inorganic Chemistry》2007,52(8):1180-1183
New ferrites ErMFe2O5 (M = Li, Na, K) were synthesized from erbium and iron(III) oxides and lithium, sodium, and potassium carbonates by solid-state annealing. According to X-ray powder diffraction, these compounds crystallize in the orthorhombic system with the following unit cell parameters: ErLiFe2O5, a = 10.510 Å, b = 10.776 Å, c = 14.270 Å, V 0 = 1616.16 Å3; Z = 16, V subcell 0 = 101.01 Å3, ρX = 6.01 g/cm3, ρpycn = 5.97 ± 0.05 g/cm3; ErNaFe2O5, a = 10.519 Å, b = 10.785 Å, c = 15.510 Å, V 0 = 1759.56 Å3, Z = 16, V subcell 0 = 109.90 Å3, ρX = 5.77 g/cm3, ρpycn = 5.72 ± 0.08 g/cm3; ErKFe2O5, a = 10.050 Å, b = 11.320 Å, c = 15.480 Å, V 0 = 1937.33 Å3, Z = 16, V subcell 0 = 121.08 Å3, ρX = 5.46 g/cm3, ρpycn = 5.41 ± 0.04 g/cm3. 相似文献
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