I am using Linq-to-sql as an ORM. I wrote this innerjoin

public IQueryable<Material> FindAllMaterials()
 {
   var materials=from m in db.Materials
               join Mt in db.MeasurementTypes on m.MeasurementTypeId equals Mt.Id
               select new { m.Mat_id, 
               m.Mat_Name, 
               Mt.Name, 
                m.Mat_Type };

  return materials;
 }

But when i compile this i got an error

Cannot implicitly convert type 'System.Linq.IQueryable<AnonymousType#1>' 
to 'System.Linq.IQueryable<CrMVC.Models.Material>'. 
An explicit conversion exists (are you missing a cast?)

Am i missing some thing... Any suggestion....