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The Effect of X‐Ray Irradiation on Conductivity of C and 2C Polytype TlInS2 Ferroelectrics
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2021-02-15 , DOI: 10.1002/pssb.202000556 Mykola Borovyi 1 , Yurii P. Gololobov 2 , Karyna Isaieva 3 , Mykola Isaiev 4
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2021-02-15 , DOI: 10.1002/pssb.202000556 Mykola Borovyi 1 , Yurii P. Gololobov 2 , Karyna Isaieva 3 , Mykola Isaiev 4
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The influence of X‐ray irradiation on DC conductivity of TlInS2 C and 2C polytypes is studied in the temperature range of 100–300 K. The X‐ray irradiation (absorbed doses are 0.9 and 2.7 kGy) leads to an increasing conductivity of both C‐ and 2C‐samples in proportion to the absorbed dose; the conductivity decreases on cooling in the temperature region of 100–300 K. An anomalous increase in conductivity is observed in C‐polytype samples on cooling in the temperature range of the incommensurate phase (197–214 K). The X‐ray irradiation causes the “blur” of that anomaly. It is established that the mechanism of hopping conductivity with variable hopping length takes place for both polytypes in the temperature range of 125–175 K, and the densities of localized states near the Fermi level (NF) are determined. Under irradiation, the density NF increases from 3.7 × 1018 eV−1 cm−3 (C) to 6.9 × 1018 eV−1 cm−3 (2C) and exceeds the initial value more than three times at D = 2.7 kGy. Using the 1D Kroning–Penney model, the role of incommensurate periodic potential in modification of electron band structure at creation of the incommensurate phases in crystals is discussed.
中文翻译：
X射线辐射对C和2C多型TlInS2铁电体电导率的影响
在100–300 K的温度范围内研究了X射线辐照对TlInS 2 C和2 C多态型的直流电导率的影响。X射线辐照（吸收剂量为0.9和2.7 kGy）导致电导率增加。既ç -和2 ç -samples成比例地被吸收的剂量; 在100-300 K的温度范围内，电导率随冷却而降低。在C中观察到电导率反常增加在不相称温度范围（197–214 K）内冷却时的多型样品。X射线照射会导致该异常现象“模糊”。可以确定的是，在125-175 K的温度范围内，两种多型体均发生了具有可变跳变长度的跳变电导率机制，并确定了费米能级（N F）附近的局域态密度。在照射下，密度N F从3.7×10 18 eV -1 cm -3（C）增加到6.9×10 18 eV -1 cm -3（2 C），并且在30 ℃时超过初始值三倍以上。D ＝ 2.7kGy。使用一维Kroning-Penney模型，讨论了在结晶中形成不相称相时不相称的周期性电势在电子能带结构的修饰中的作用。
更新日期：2021-02-15
中文翻译：
X射线辐射对C和2C多型TlInS2铁电体电导率的影响
在100–300 K的温度范围内研究了X射线辐照对TlInS 2 C和2 C多态型的直流电导率的影响。X射线辐照（吸收剂量为0.9和2.7 kGy）导致电导率增加。既ç -和2 ç -samples成比例地被吸收的剂量; 在100-300 K的温度范围内，电导率随冷却而降低。在C中观察到电导率反常增加在不相称温度范围（197–214 K）内冷却时的多型样品。X射线照射会导致该异常现象“模糊”。可以确定的是，在125-175 K的温度范围内，两种多型体均发生了具有可变跳变长度的跳变电导率机制，并确定了费米能级（N F）附近的局域态密度。在照射下，密度N F从3.7×10 18 eV -1 cm -3（C）增加到6.9×10 18 eV -1 cm -3（2 C），并且在30 ℃时超过初始值三倍以上。D ＝ 2.7kGy。使用一维Kroning-Penney模型，讨论了在结晶中形成不相称相时不相称的周期性电势在电子能带结构的修饰中的作用。
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