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Ionic conductivity of ScF3 single crystals (ReO3 type)

机译：ScF3单晶（ReO3型）的离子电导率

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Electrical conductivity sigma of ScF3 single crystals (sp. gr. , ReO3 structure type) has been studied by impedance spectroscopy and compared with the electrical conductivity of rare earth HoF3 (beta-YF3 type) and LaF3 (tysonite type) trifluorides. ScF3 crystals obtained by Bridgman directional solidification have ionic conductivity sigma = 4 x 10(-8) S/cm at 673 K. It is smaller than the sigma values for LaF3 (sp. gr. ) and HoF3 (sp. gr. Pnma) single crystals by a factor of 10(4)-10(5). The low conductivity of ScF3 crystals is due to the weak coordinating ability (coordination number CN = 6) and low electronic polarizability (alpha (cat) = 1.1 (3)) of Sc3+ ions. Mobile V (F) (+) vacancies and less mobile interstitial V (i) (-) ions (defects are formed according to the Frenkel mechanism) are involved in the ion transport. HoF3 and LaF3 single crystals have a high coordinating ability (CN = 9 for Ho3+ and CN = 11 for La3+) and a high electronic polarizability of cations (alpha (cat) = 1.6-1.9 (3) for Ho3+ and alpha (cat) = 2.2 (3) for La3+). Only mobile V (F) (+) vacancies (defects are formed according to the Schottky mechanism) are involved in ion transport.
机译：ScF3单晶（sp。gr。，ReO3结构类型）的电导率σ已通过阻抗谱进行了研究，并与稀土HoF3（β-YF3型）和LaF3（钛铁矿型）三氟化物的电导率进行了比较。通过Bridgman定向凝固获得的ScF3晶体在673 K时的离子电导率sigma = 4 x 10（-8）S / cm。它小于LaF3（sp。gr。）和HoF3（sp。gr。Pnma）的sigma值。单晶体的10（4）-10（5）倍。 ScF3晶体的低电导率归因于Sc3 +离子的弱配位能力（配位数CN = 6）和低电子极化率（α（cat）= 1.1（3））。迁移的V（F）（+）空位和较少的迁移的间隙V（i）（-）离子（根据Frenkel机理形成缺陷）参与离子迁移。 HoF3和LaF3单晶具有很高的配位能力（对于Ho3 +，CN = 9，对于La3 +，CN = 11），并且阳离子的电子极化率高（对于Ho3 +和alpha（cat）= 1.6-1.9（3）= La3 +的2.2（3）。离子迁移只涉及可移动的V（F）（+）空位（根据肖特基机理形成缺陷）。

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