NOVELTY - Glassy or at least partly crystalline bonding material comprises: greater than 30-55 mole% of silicon dioxide; 0.5-15 mole% of boron trioxide; 0-1.7 mole% of aluminum oxide; 5-30 mole% of barium oxide; 5-40 mole% of calcium oxide; 0-10 mole% of magnesium oxide; 0-5 mole% of zinc oxide; 0-5 mole% of cesium oxide; 0-5 mole% of metal oxide and/or a mixture of metal oxides; 0-2 mole% of alkaline metal oxide and/or a mixture of alkali metal oxides; 0-5 mole% of yttrium(III) oxide; and less than 1 of lanthanum oxide.    USE - The bonding material is useful: for preparing joint connections and/or ducts, preferably in fuel cells, electrolysis cells, sensors, and/or spark plug; for bonding ferritic stainless steels and/or chromium-containing alloys, preferably chromium-based alloy (CFY); for preparing sintered bodies and/or green sheets; and as an additive material in a glass and/or glass ceramics (all claimed), where the fuel cells are useful as an energy source in motor vehicles.    ADVANTAGE - The bonding material has high stability and improved thermal coefficient of expansion and adhesion property.    DETAILED DESCRIPTION - Glassy or at least partly crystalline bonding material having a coefficient of thermal expansion alpha (20-300) of greater than or equal to 7.10-6 K-1 comprises: greater than 30-55 mole% of silicon dioxide; 0.5-15 mole% of boron trioxide; 0-1.7 mole% of aluminum oxide; 5-30 mole% of barium oxide; 5-40 mole% of calcium oxide; 0-10 mole% of magnesium oxide; 0-5 mole% of zinc oxide; 0-5 mole% of cesium oxide; 0-5 mole% of metal oxide and/or a mixture of metal oxides comprising zirconium dioxide, titanium dioxide and/or tin dioxide; 0-2 mole% of alkaline metal oxide and/or a mixture of alkali metal oxides comprising lithium oxide, sodium oxide and/or potassium oxide; 0-5 mole% of yttrium(III) oxide; less than 1 of lanthanum oxide; and greater than 0-5 mole% of a mixture of yttrium(III) oxide, lanthanum oxide and metal oxide and/or a mixture of metal oxides comprising neodymium(III) oxide or praseodymium(III) oxide. An INDEPENDENT CLAIM is included for a joint connection comprising at least two elements that are made of ceramic and are connected by the bonding material, two elements made of a metal and/or metal alloys connected by the bonding material, and an element made of a metal and/or a metal alloy and an element made of a ceramic that connected by the joining material.