Thermolysis of potassium tetraperoxochromate(V). I. Isothermal conditions

Acoustic Probing of Deep Centres in III–V Semiconductors

“…Analysing (16) leads to the conclusion that T can coincide with t t only under the condition t t t d 4 t i t M which corresponds to the full exhaustion of deep centres during the relaxation process [13]. This is impossible for our specimens containing x 1023m-3 deep centres against the concentration of piezoelectric charges of NV m-3.…”

“…Taking into consideration for simplicity only a material with monopolar electron conductivity, one can construct the simplest model of a charge relaxation kinetics in our specimens in the following way. The standard balance equation for electrons in the band is Solving (11) to (13) is greatly simplified in our case by the circumstance that they have a solution for which the field E is linear with z for any moment of time and n and f are not dependent on z at all. If a specimen is infinite in the z-direction, the charge relaxation would be exactly described by this solution due to the linear dependence of E on z.…”

“…The special form of the wanted solution allows to eliminate the field E from (1 1) to (13) and to reduce them to a pair of ordinary differential equations where (1f ) is noted as…”

“…Such a replacement of alternating excitation by a steplike one retains the relaxation time [9] but allows to make (14) autonomous. In such a formulation the problem of solving (14) and (15) was treated in [13] where an expression for the relaxation time was obtained in the form where o1 = = t t n o / ( N c f o~o ) is an electron capture time of a deep centre, t,, = 7,n0/n' = h / ( p E ( h ) ) may be considered as the time of electron drift through the specimen.…”

The generalisation of a multi-reaction model for polynomial ramping of temperature

“…For in-depth study of solid-state reactions, these techniques can be accompanied with commentary methods. The information imparted through chemically specific units is helpful to explore the overall kinetic scheme [25][26][27][28][29]. The TG technique mainly records measured mass loss from a sample due to gas formation as function of time or temperature for the predefined thermal history.…”