Modelling of the humidity effect on the barrier height in SnO2 varistors

Skuratovsky, I.; Glot, A.B.; Traversa, Enrico

doi:10.1016/j.mseb.2005.11.039

Cited by 9 publications

(30 citation statements)

References 16 publications

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“…Temperature dependence of dc electrical conductivity σ(T) was obtained in the range 300-473 K at heating and cooling the samples in air with a rate close to 1 K/min. Below about 350 K, conductivity was decreased at heating due to desorption of water molecules [11,18]. The activation energy of electrical conduction E σ (0) at low electric fields (in ohmic region) was estimated from the high-temperature (350-473 K) part of σ 0 (T) dependence using the equation:…”

Section: Methodsmentioning

confidence: 99%

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Non-ohmic conduction in tin dioxide based ceramics with copper addition

Gaponov¹,

Glot²

2011

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. The current-voltage characteristics and temperature dependences of electrical conductivity in SnO 2 -Co 3 O 4 -Nb 2 O 5 -Cr 2 O 3 -CuO semiconductor ceramics are studied, and possible mechanism of non-ohmic conduction in these materials is discussed. Due to addition of CuO up to 0.5 mol.%, the nonlinearity coefficient is increased up to 75, and the electric field is decreased down to (at ). It makes CuO addition useful for the preparation of SnO (the barrier height φ) is decreased with an increase in the electric field E. The higher slope of the dependence at high fields can be related to a participation of minority carriers (holes). The addition of more than 0.5 mol.% CuO leads to degradation of the varistor effect due to percolation via quite conductive CuObased intergranular phase.

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Section: Methodsmentioning

confidence: 99%

“…Below about 350 K, conductivity of ceramics with CuO addition in the range 0-0.5 mol.% (curves 1-3 in Fig. 2) was affected by humid air (see [11,13,18]). In the case of low CuO amounts, humid air can penetrate inside the sample and reach grain-boundary areas.…”

Section: To 5)mentioning

confidence: 99%

Non-ohmic conduction in tin dioxide based ceramics with copper addition

Gaponov¹,

Glot²

2011

Semicond. Phys. Quantum Electron. Optoelectron.

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“…The multicomponent ceramics has a lower sensing response -2.9 at the 580 K (see Table 2). It is known that the conductivity of the WO 3 ceramics is controlled by the intergrainular potential barriers [1,23]. The barriers are formed by adsorbed oxygen at the WO 3 grain boundary.…”

Section: Tablementioning

confidence: 99%

Gas sensing properties of WO3-based ceramics to ethanol vapors

Lyashkov

Тонкошкур

Makarov

2010

Sensors and Actuators B: Chemical

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“…The humidity-sensitive or varistor properties can prevail depending upon the additions to the ceramic samples. The combining of both properties is due to the grain-boundary nature of both effects [15][16][17][18]. Therefore the devices with combined properties of a relative-humidity sensor and a varistor can be used.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore the devices with combined properties of a relative-humidity sensor and a varistor can be used. For example, such ceramics were investigated earlier in SnO 2 -ZnO-CoO system with SiO 2 , GeO 2 or Bi 2 O 3 additions [8] and in SnO 2 -Co 3 O 4 -Nb 2 O 5 -Cr 2 O 3 system with Bi 2 O 3 [15,16], V 2 O 5 [17] or CuO [18] additions. The GeO 2 , Bi 2 O 3 , V 2 O 5 and CuO oxides have low melting temperatures which are less than burning temperatures of samples.…”

Section: Introductionmentioning

confidence: 99%

HUMIDITY SENSORS BASED ON SnO2 -Co3 O4 -Nb2 O5 -Cr2 O3 SEMICONDUCTOR VARISTOR CERAMICS

Гапонов¹

2018

SEMST

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The varistor effect in SnO 2 -Co 3 O 4 -Nb 2 O 5 -Cr 2 O 3 ceramics with different additions is accompanied by a strong humidity-sensitivity effect in the low-field electrical conductivity. The low-field electrical conductivity and dielectric permittivity of ceramics are increased when air relative humidity rises from 10 to 93%. Such effects are observed both in the samples prepared by solid-phase sintering without or with CaO addition and in the samples prepared by liquid-phase sintering with CuO or V 2 O 5 additions. The lowest humidity-sensitivity effect was found in the liquid-phase sintering samples due to the more solid structures and the secondary phases which are located between the SnO 2 grains. For the studied samples the values of humidity sensitivity coefficient 1.8·10 3 -3.2·10 5 at low electric fields and the nonlinearity coefficient 30-57 at high electric fields (E 1 = 5.3-7 kV·cm -1 ) were calculated. The properties of oxide ceramics are explained by electrical conductivity which is controlled by the grain-boundary potential barriers. The barrier height decreases with the increase both of air relative humidity at low electric fields and of voltage at high electric fields. Strong humidity sensitivity is a key factor for sensor application of SnO 2based ceramics. кераміці з різними домішками супроводжувався сильним вологочутливим ефектом для електричної провідності у слабкому полі. Електропровідність у слабких полях і діелектрична проникність кераміки збільшувались при зростанні відносної вологості повітря з 10 до 93%. Такі ефекти спостерігались як для твердо-фазних синтезованих зразків без або з CaO домішкою, так і для рідко-фазних синтезованих зразків з CuO або V 2 O 5 домішками. Найменшу вологочутливість мають рідкофазні синтезовані зразки у зв'язку з їх більш щільною структурою й існуючими вторинними фазами, які розташовуються між зернами SnO 2 . Для досліджених зразків обчислені значення коефіцієнта вологочутливості 1,8·10 3 -3,2·10 5 при слабких електричних полях і коефіцієнта нелінійності 30-57 при сильних електричних полях (E 1 = 5,3-7 кВ·см -1 ). Властивості оксидної кераміки пояснюються електричною провідністю, яка контролюється потенціальними бар'єрами на межах зерен. Висота бар'єрів зменшується як зі збільшенням відносної вологості повітря при слабких електричних полях, так і напруги при сильних електричних полях. Велика вологочутливість є ключовим фактором для сенсорного використання кераміки на основі SnO 2 .Ключові слова: сенсор вологості, оксид олова, варистор, оксидна кераміка, межа зерен, електрична провідність СЕНСОРЫ ВЛАЖНОСТИ НА ОСНОВЕ ПОЛУПРОВОДНИКОВОЙ ВАРИСТОРНОЙ КЕРАМИКИ SnO 2 -Co 3 O 4 -Nb 2 O 5 -Cr 2 O 3 А. В. ГапоновАннотация. Варисторный эффект в SnO 2 -Co 3 O 4 -Nb 2 O 5 -Cr 2 O 3 керамике с различными добавками сопровождался сильным влагочувствительным эффектом для электрической проводимости в слабом поле. Электропроводность в слабых полях и диэлектрическая проницаемость керамики увеличивались при повышении относительной влажности воздуха с 10 до 93%. Такие эффекты набл...

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Modelling of the humidity effect on the barrier height in SnO2 varistors

Cited by 9 publications

References 16 publications

Non-ohmic conduction in tin dioxide based ceramics with copper addition

Non-ohmic conduction in tin dioxide based ceramics with copper addition

Gas sensing properties of WO3-based ceramics to ethanol vapors

HUMIDITY SENSORS BASED ON SnO2 -Co3 O4 -Nb2 O5 -Cr2 O3 SEMICONDUCTOR VARISTOR CERAMICS

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