What is TG and DTA?
What is TG and DTA?
TG/DTA is a simultaneous thermal analyzer that can characterize multiple thermal properties of a sample in a single experiment. A TG/DTA measures the change in sample weight as a function of temperature (and/or time) under controlled gas atmosphere and temperature.
What is DTA test?
Definitions of Differential Thermal Analysis (DTA) A technique in which the difference in temperature between the sample and a reference material is monitored against time or temperature while the temperature of the sample, in a specified atmosphere, is programmed.
What is the basic difference between TG DTG DTA in Thermogravimetric analysis?
TGA and DTG can be obtained from the same result, while DTA and DSC are different. DTA is based on the temperature difference while DSC is based on the heat flow difference.
How does DTA differ from TGA?
TGA measures change in mass – loss of weight like evaporation, decomposition when some products are gaseous or even oxidation when metallic samples are gaining weight. DTA helps you to find at which temperatures reactions happen in your material and tells you if these changes are endothermic or exothermic.
What are the factors affecting DTA?
Discuss factors affecting DTA results
- Environmental factor. The DTA technique is more sensitive to the gaseous environment around the sample than the TG. Furthermore, the reaction of gaseous atmosphere with the sample may also produce extra peaks in the curve.
- Instrumental factors. (a).
- Sample characteristics. (i).
What is DTA principle?
Differential Thermal Analysis (DTA) • Principle: The basic principle involved in DTA is the temperature difference (∆T) between the test sample and an inert reference sample under controlled and identical conditions of heating or cooling is recorded continuously as a function of temperature or time, thus the heat …
What is TG curve?
In TG, the mass change of a carbon or a carbonaceous material is continuously measured while the sample is heated or cooled in a defined atmosphere. TG curve shows a continuous mass loss of about 51.2% from room temperature to 400°C with shallow plateaus (12.1, 7.6 and 31.6% mass losses for respective plateaus).
Is DTA better than DSC?
Differential thermal analysis (DTA) is suited for the determination of characteristic temperatures, while differential scanning calorimetry (DSC) additionally allows for the determination of caloric values such as the heat of fusion or heat of crystallisation.
Which factor does not affect DTA curves?
To avoid this situation, the sample can be diluted with inert materials. To measure temperature of phase transformations, the maximum temperature should not be varied with sample size. The weight of the sample and the rate of heating do not affect the shape of peaks in DTA.
Which sensor is used in DTA?
LVDT sensor with free moveable plunger. The non-contact measurement is completely wear-free. LVDT sensors are primarly used for measurement of movement, displacement and position in vehicles and machines.
What are the factor that can affect TG curve?
Q. Temperature distribution within the TG system should be affected by the re- flectance of the sample cell surface. The reflectance can be classified into three type; (i) reflective (Pt-radiation shield), (ii) absorbent (carbon ‘black-body’) and (iii) transmittant (quartz).
What is TG DTG analysis?
DTG is a type of thermal analysis in which the rate of material weight changes upon heating is plotted against temperature and used to simplify reading the weight versus temperature thermogram peaks which occur close together.
What kind of balance does Rigaku TG-DTA use?
Rigaku’s TG-DTA adopts the horizontal differential triple-coil balance that cancels various fluctuations causing TG drift to achieve a highly accurate weight change measurements. Also, the sample controlled TG (SCTG) method is equipped as a standard.
How does the DTA relate to the TG?
TG provides information on the weight changes derived from reactions such as dehydration, evaporation, sublimation, desorption, decomposition, adsorption, oxidation, while DTA provides temperature information associated with endo- or exothermic reactions.
What are the modes of the TG-DTA / MS?
It is equipped with 2 different modes, namely electron ionization (EI) and soft ionization by photoionization (PI), which are available with just one-click on the software, suitable for qualitative analysis of evolved gases.