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Dielectric properties and electrical conductivity of LiNbO3:Zn crystals in the temperature range 310–900 К
Solid State Ionics ( IF 3.2 ) Pub Date : 2019-12-19 , DOI: 10.1016/j.ssi.2019.115178
M.N. Palatnikov , A.V. Yatsenko , V.A. Sandler , N.V. Sidorov , O.V. Makarova , D.V. Manukovskaya

Electrical conductivity and dielectric constant have been researched in a series of crystals LiNbO3:Zn(~4.0–9.0 mol% ZnО in a melt) by application of constant voltage with a couple of electrodes (~<500 K) and impedance spectroscopy (~>500 К). In order to compare results we have also researched electrical conductivity σdc of congruent LiNbO3congr and magnesium doped LiNbO3:Mg crystals. We have established that electron contribution to electrical conductivity of doped crystals LiNbO3:Zn and LiNbO3:Mg is greatly smaller than that of a congruent crystal LiNbO3congr. A decrease in conductivity is apparently connected with a restructure of LiNbO3 crystals at high concentrations of magnesium and zinc. Doping of crystals with Zn leads to drastic changes not only in the electron conductivity area (T < 500 K), but also in a lithium ion conductivity area (Т > 500 K). At this, parameters of temperature dependence of lithium ion conductivity depend on both zinc concentration and crystallographic orientation of samples.



中文翻译:

LiNbO 3:Zn晶体在310–900К温度范围内的介电性能和电导率

通过使用一对电极(〜<500 K)施加恒定电压和阻抗光谱法(~~),在一系列LiNbO 3:Zn(〜4.0–9.0 mol%ZnО在熔体中)晶体中研究了电导率和介电常数。> 500К)。为了比较的结果,我们还研究了电导率σ直流全等的LiNbO的3congr和镁掺杂的LiNbO 3:Mg的晶体。我们已经确定,电子对掺杂晶体LiNbO 3:Zn和LiNbO 3:Mg的电导率的贡献远小于全同晶体LiNbO 3congr的电导率。电导率的降低显然与LiNbO 3的重组有关高浓度的镁和锌的晶体。用Zn掺杂晶体不仅会导致电子电导率区域(T <500 K)急剧变化,而且还会导致锂离子电导率区域(Т> 500 K)发生剧烈变化。此时,锂离子传导率的温度依赖性参数取决于锌浓度和样品的晶体学取向。

更新日期:2019-12-19
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