Thermomiotic ceramics have been arousing interest due to their property of presenting a low, near or zero thermal expansion under hearing. This property comes from a transverse vibration of the anion, which results in an approximation of atoms in certain crystallographic axes. The A2M3O12 family (A = a trivalent cation and M = Mo6 positive or W6 positive) presents a phase transition from monoclinic to orthorhombic, with only the orthorhombic phase exhibiting thermomiotic behavior. This family is widely researched since it has the advantage of allowing a wide chemical flexibility without changing the crystalline structure and consequently allowing adjustments in the coefficient of thermal expansion according to the application, which the material is intended. Thermal expansion close to zero can lead to a promising high thermal shock resistance. This work aimed to study the thermal and mechanical properties of Al2W3O12 that has low thermal expansion with the goal of determining its thermal shock resistance by the Hasselman figure of merit. For this, all its thermal properties (thermal expansion and conductivity) and mechanical (Young modulus and mechanical strength) were obtained experimentally and presented a promising value of 120K (comparable to sapphire) for thermal shock resistance by the figure of merit of Hasselman under severe heating. A second research was developed with the goal of refining the microstructure and increasing the relative density of the Al2W3O12 bulk ceramics and thus increasing its mechanical properties. A synthesis by co-precipitation, folled by an isostatic pressing and a three steps sintering were carried out, obtaining an increase of 91 percent to 96 percent in the relative density, with increase of 19 percent in modulus of elasticity and 35 percent in Vickers hardness when compared to conventional sintering. The thermal expansion of a new material (In0,5(ZrMg)0,75Mo3O12) with promising thermal expansion close to zero (10-7 K1), calculated by mixing rule was studied in the third chapter of this thesis. The material was synthesized by total evaporation. Its intrinsic thermal expansion coefficient was determined in situ by X-ray diffraction and presented a value of 1.6x10-7 K-1 in the temperature range of 100 to 500 Celsius degrees, while the coefficient of expansion of the bulk obtained by dilatometry, was 6.68 x 10-7 K-1, in the temperature range of 100 to 800 Celsius degrees. This material presents a phase transition from monoclinic to orthorhombic at 82 Celsius degrees, which limits its use as thermomiothic material at temperatures above 100 Celsius degrees.