Electrolytic coloration below 0°C and spectral properties of ammonium alum crystals using a pointed anode

Gu, Hongen; Hao, Xiaoqing

doi:10.1016/j.saa.2015.03.066

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…Gu and Li [15] studied the electrolytic coloration below 373 K and spectral properties of potassium alum crystals. Gu and Hao [16] studied the electrolytic coloration below 273 K and spectral representation properties of ammonium alum crystals with the help of a pointed anode. Petrusevski [17] studied the vibrational spectra and crystallographic results in a number of alums.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of ammonium iron sulphate-dodecahydrate alum crystal

Khan

2022

Mater. Plus

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The statistical Green function theory and extended two sublattice pseudospin coupled-mode model Hamiltonian. The modified model summing with phonon anharmonic couplings, extra spin-lattice couplings, direct spin-spin coupling together with an applied electric field has been used to explain the dielectric properties of ammonium iron alum crystal. The expressions for energy shift, linewidth, ferroelectric soft mode frequency, dielectric permittivity, and dielectric loss tangent are derived. By fitted the model values of different parameters in the above theoretical expressions. The temperature dependence of soft mode frequency, dielectric permittivity, and dielectric loss properties have been numerically calculated. Our theoretical obtained results compared well agreement with experimental results reported by others.

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Section: Introductionmentioning

confidence: 99%

Dielectric properties of ammonium iron sulphate-dodecahydrate alum crystal

Khan

2022

Mater. Plus

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“…Gu and Li [9] have done spectral studies of alums. Gu and Hao [10] have studied electrolytic coloration below 0 ᶱ C and spectral properties of ammonium alum crystals using a pointed anode. Zhang et al [11] have carried out experimental study on hysteresis curves on alums.…”

Section: Introductionmentioning

confidence: 99%

Changes in Ferroelectric Properties of Masd Alum Along With Temperature by Using PLCM Model

Mamgain¹,

Upadhyay²

2019

J. Mountain Res.

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With addition of third-and fourth-order phonon anharmonic interactions, and extra spin-lattice interaction term into pseudospin-lattice coupled mode (PLCM) model, MASD alum has been studied. Employing double time temperature dependent Green′s function technique expressions for shift and width of response function, normal mode frequency, dielectric constant and loss stangent have been derived for MASD alum. Numerical calculation has been done. Theoretical results have been compared with experimental results of Pepinsky et al. [16]. A good agreement has been found.

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“…That is, O 2− -doped LiF crystals can be colored electrolytically at various coloration temperatures and voltages using a homemade electrolysis apparatus with a pointed cathode and a flat anode. In our recent researches, various inorganic crystals containing anionic impurities or crystalline water and organic crystals have been colored electrolytically using a homemade electrolysis apparatus [15][16][17][18][19][20][21][22][23][24]. In this work, OMC LiF crystals are colored electrolytically using the same electrolysis apparatus with a pointed cathode and a flat anode.…”

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confidence: 99%